CBET (Certified Biomedical Equipment Technician) Exam — Questions and Answers

Question 1: A pulse oximeter (SpO2) determines a patient's oxygen saturation level by measuring the differential absorption of what?

The electrical impedance of blood flow in the capillaries.
Ultrasonic waves reflected by red blood cells.
Blue and green light by venous blood.
Red and infrared light by arterial blood. (Correct answer)

Correct answer: Red and infrared light by arterial blood.

Pulse oximetry works on the principle of spectrophotometry. The probe emits both red (approx. 660 nm) and infrared (approx. 940 nm) light through a pulsating arterial blood bed. Oxygenated hemoglobin and deoxygenated hemoglobin absorb these two wavelengths of light differently. The monitor analyzes the ratio of the light absorbed during the arterial pulsation to calculate the oxygen saturation (SpO2).

Question 2: When calibrating a patient scale used for medication dosing, a biomedical technician should use NIST-traceable weights primarily to:

Satisfy Joint Commission aesthetic requirements
Ensure measurements are accurate relative to a national standard (Correct answer)
Save time compared to manufacturer weights
Avoid purchasing manufacturer-specific calibration kits

Correct answer: Ensure measurements are accurate relative to a national standard

NIST-traceable weights provide an unbroken chain of calibration to national standards, ensuring measurement accuracy and regulatory compliance.

Question 3: A NMES (Neuromuscular Electrical Stimulation) unit used for muscle rehabilitation produces biphasic waveforms. What is the clinical advantage of a balanced (charge-balanced) biphasic waveform over an unbalanced monophasic waveform for long-term stimulation?

The equal positive and negative charge phases cancel net DC charge accumulation, preventing electrode-skin interface damage during extended use (Correct answer)
Balanced waveforms prevent patient perception of the electrical stimulus, improving compliance
Balanced biphasic waveforms stimulate type II fast-twitch fibers more selectively
Biphasic waveforms deliver twice the energy per pulse, reducing treatment time by 50%

Correct answer: The equal positive and negative charge phases cancel net DC charge accumulation, preventing electrode-skin interface damage during extended use

A charge-balanced biphasic waveform has equal positive and negative charge per pulse (net charge = zero). This prevents the accumulation of net ionic charge at the electrode-tissue interface that would otherwise cause electrolytic reactions, pH changes, and tissue/electrode damage over long stimulation sessions. This is particularly important for implanted neurostimulators and surface electrodes used in extended NMES protocols.

Question 4: When a sequential compression device is brought in, it is seen that the sleeve pressure is low. What needs to be checked first?

Check the circuitry to the alert light
Check the pressure gauge for the sleeve
Check the function of the pump
Check the chambers and tubing for leaks (Correct answer)

Correct answer: Check the chambers and tubing for leaks

A sequential compression device (SCD) operates by inflating and deflating air chambers within a sleeve to promote blood circulation. If the sleeve pressure is low, the most common and immediate cause is a leak within the system. Therefore, checking the chambers and tubing for any leaks is the crucial first step in troubleshooting, as any breach would prevent the device from maintaining the intended therapeutic pressure.

Question 5: A nurse reports that a patient's invasive arterial line is showing an overdamped waveform. Which of the following is the BEST corrective action?

Replace the transducer with a higher compliance model
Increase the flush bag pressure above 300 mmHg
Reposition the transducer above the phlebostatic axis
Check for air bubbles, clots, or kinked tubing in the system (Correct answer)

Correct answer: Check for air bubbles, clots, or kinked tubing in the system

Overdamping is most commonly caused by air bubbles, clots, or mechanical occlusion that attenuates pressure wave transmission.

Question 6: Which PM task is unique to laser surgical equipment compared to conventional electrosurgical units?

Checking the dispersive electrode impedance monitor
Verifying beam alignment, output power, and protective eyewear integrity (Correct answer)
Measuring RF leakage current at the patient return electrode
Testing arc suppression capacitors

Correct answer: Verifying beam alignment, output power, and protective eyewear integrity

Laser PM includes optical alignment verification, measured output power against rated specifications, and inspection of safety interlocks and wavelength-appropriate eyewear.

Question 7: Which concept describes the practice of adjusting PM frequency based on a device's historical failure rate and clinical risk level?

Corrective maintenance scheduling
Predictive failure indexing
Total productive maintenance (TPM)
Reliability-centered maintenance (RCM) (Correct answer)

Correct answer: Reliability-centered maintenance (RCM)

Reliability-centered maintenance uses failure history and risk analysis to optimize PM intervals, reducing unnecessary maintenance while protecting patient safety.

Question 8: A harmonic scalpel is a surgical instrument that cuts and coagulates tissue. What is the underlying physical principle it uses to achieve this effect?

Focused high-intensity laser energy
Radiofrequency electrical current
High-frequency ultrasonic vibration (Correct answer)
Pressurized argon gas plasma

Correct answer: High-frequency ultrasonic vibration

A harmonic scalpel uses a piezoelectric transducer in the handpiece to convert electrical energy into high-frequency (typically 55,500 Hz) ultrasonic mechanical vibrations. This vibration is transferred to the blade, which denatures proteins and creates a coagulum to seal vessels while simultaneously cutting tissue with minimal thermal spread.

Question 9: Which of the following correctly traces the primary path of electrical conduction in the heart, which is fundamental to understanding ECG arrhythmias?

SA Node -> AV Node -> Bundle of His -> Purkinje Fibers (Correct answer)
AV Node -> SA Node -> Bundle of His -> Purkinje Fibers
Bundle of His -> Purkinje Fibers -> SA Node -> AV Node
Purkinje Fibers -> Bundle of His -> AV Node -> SA Node

Correct answer: SA Node -> AV Node -> Bundle of His -> Purkinje Fibers

The normal electrical impulse in the heart originates in the Sinoatrial (SA) node, travels to the Atrioventricular (AV) node, then moves down the Bundle of His, and finally spreads through the ventricles via the Purkinje fibers, causing contraction. Understanding this pathway is crucial for interpreting ECGs.

Question 10: A blood gas analyzer's pO₂ electrode consistently reads 10–15% lower than expected across all QC levels. After confirming the sample path is clear, what is the most likely cause?

Contaminated sodium reference electrode
Air bubbles trapped in the QC sample syringe
A fouled or expired Clark electrode membrane (Correct answer)
Incorrect barometric pressure input

Correct answer: A fouled or expired Clark electrode membrane

The Clark polarographic electrode measures oxygen via a gas-permeable membrane. As the membrane ages or becomes protein-fouled, it restricts O₂ diffusion to the cathode, causing consistently low pO₂ readings across all control levels. Air bubbles typically cause falsely HIGH readings and affect only individual samples, not all QC levels.

Question 11: What does 'kVp' control in an X-ray generator?

Depth of ultrasound penetration
Total number of X-ray photons produced
Penetrating power (energy) of the X-ray beam (Correct answer)
Rotation speed of the CT gantry

Correct answer: Penetrating power (energy) of the X-ray beam

Peak kilovoltage (kVp) sets the maximum energy of X-ray photons, determining how well the beam penetrates dense tissues like bone.

Question 12: What type of pump mechanism do most volumetric IV infusion pumps use to deliver fluids?

Peristaltic pump mechanism that sequentially compresses IV tubing (Correct answer)
Centrifugal pump
Diaphragm pump
Gear pump

Correct answer: Peristaltic pump mechanism that sequentially compresses IV tubing

Most volumetric IV infusion pumps use a peristaltic mechanism that sequentially compresses the tubing to push fluid forward.

Question 13: How should a biomedical technician verify that a repaired medical gas outlet is delivering the correct gas before returning it to service?

Ask a nurse to smell the gas
Use a gas-specific analyzer to verify gas identity, then test flow rate and pressure (Correct answer)
Check the color coding only
Connect a flowmeter and check the reading

Correct answer: Use a gas-specific analyzer to verify gas identity, then test flow rate and pressure

A gas-specific analyzer must be used to positively verify the gas identity at the outlet.

Question 14: Which PM task is specific to electrosurgical units (ESUs)?

Calibrating SpO2 probe wavelength
Testing return electrode contact quality monitoring (RECM) (Correct answer)
Checking IV tubing patency
Verifying suction regulator pressure

Correct answer: Testing return electrode contact quality monitoring (RECM)

RECM testing verifies the ESU will alarm and cut power if the return electrode contact degrades, preventing patient burns.

Question 15: Dry heat sterilization at 160°C requires what minimum exposure time to achieve sterilization?

120 minutes (Correct answer)
60 minutes
30 minutes
180 minutes

Correct answer: 120 minutes

Dry heat sterilization at 160°C (320°F) requires a minimum of 120 minutes to kill all microorganisms, as dry heat is less efficient than moist heat.

Question 16: A biomedical technician is verifying a medical air compressor system. Which parameter must be continuously monitored and alarmed per NFPA 99?

Dew point of the air supply (Correct answer)
Filter replacement interval
Ambient temperature of the compressor room
Compressor oil level

Correct answer: Dew point of the air supply

NFPA 99 requires continuous monitoring and alarming of the dew point of medical air to ensure adequate moisture removal and prevent contamination.

Question 17: What is the purpose of a zone valve in a medical gas pipeline system?

To filter contaminants from the gas supply
To mix gases to the correct concentration
To regulate gas pressure at each outlet
To allow isolation of gas supply to a specific area for maintenance or emergencies without affecting the entire facility (Correct answer)

Correct answer: To allow isolation of gas supply to a specific area for maintenance or emergencies without affecting the entire facility

Zone valves allow specific sections to be shut off without interrupting supply to the rest of the facility.

Question 18: Which regulatory standard specifically mandates that clinical laboratories run quality control specimens at defined intervals before reporting patient results?

FDA 510(k) premarket notification
ISO 9001 General Quality Management
NFPA 99 healthcare facilities standard
CLIA '88 (Clinical Laboratory Improvement Amendments) (Correct answer)

Correct answer: CLIA '88 (Clinical Laboratory Improvement Amendments)

CLIA '88 (Clinical Laboratory Improvement Amendments of 1988) sets federal standards for all U.S. clinical laboratory testing, including requirements to run calibrators and QC at minimum defined frequencies before reporting patient results. ISO 9001 is a generic quality standard, 510(k) governs device clearance, and NFPA 99 covers utilities and medical gases.

Question 19: A biomedical technician must ensure an ECG machine's patient lead leakage current does not exceed which limit for a CF-type device per IEC 60601-1?

50 µA under normal conditions
100 µA under normal conditions
10 µA under normal conditions (Correct answer)
500 µA under normal conditions

Correct answer: 10 µA under normal conditions

For CF (cardiac floating) applied parts, IEC 60601-1 limits patient leakage current to 10 µA under normal conditions due to direct cardiac risk.

Question 20: In nuclear medicine, the term 'half-life' as applied to a radiopharmaceutical refers to:

Time required to synthesize the radiopharmaceutical
Time for 50% of injected activity to be excreted by the kidneys
Duration of the imaging window after injection
Time for radioactive decay to reduce activity to half its initial value (Correct answer)

Correct answer: Time for radioactive decay to reduce activity to half its initial value

Physical half-life is the time required for half the radioactive atoms in a sample to undergo decay, reducing activity by 50%.

Question 21: What are the common sources of artifact in ECG monitoring and how can they be minimized?

Artifact is unavoidable
Artifact only comes from equipment malfunction
Common sources include muscle tremor, movement, poor electrode contact, 60Hz interference, and respiratory drift, minimized through proper skin preparation (Correct answer)
Only EMI causes artifact

Correct answer: Common sources include muscle tremor, movement, poor electrode contact, 60Hz interference, and respiratory drift, minimized through proper skin preparation

ECG artifact comes from multiple sources that can be minimized through proper electrode application and environmental controls.

Question 22: A newly installed, permanently wired (fixed) piece of medical imaging equipment is being tested. Before any grounds are connected, what is the maximum allowable ground leakage current according to NFPA 99 standards?

10 milliamps (Correct answer)
500 microamps
1 milliamp
5 milliamps

Correct answer: 10 milliamps

For permanently wired equipment, NFPA 99 allows for a higher leakage current limit compared to portable devices. The ground leakage current, tested before the permanent ground is connected, must not exceed 10.0 mA. This test is typically performed on new installations.

Question 23: When performing electrical safety testing on a powered surgical drill, which test is used to verify that current does not flow through the equipment's chassis to ground during normal operation?

Chassis leakage current test (Correct answer)
Dielectric strength test
Ground continuity test
Insulation resistance test

Correct answer: Chassis leakage current test

The chassis leakage current test measures any unintended current flowing from the equipment chassis to ground, ensuring patient and user safety.

Question 24: What is the purpose of aeration after ethylene oxide (EtO) sterilization?

To cool the sterilization chamber
To activate the sterilant residuals
To re-humidify the sterilized materials
To remove toxic EtO residues from processed items (Correct answer)

Correct answer: To remove toxic EtO residues from processed items

EtO leaves toxic residues on sterilized items that can cause patient harm; aeration allows the residues to off-gas to safe levels before use.

Question 25: According to NFPA 99, the maximum allowable ground resistance for a receptacle in a patient care area is:

1.0 ohms
0.2 ohms
0.1 ohms (Correct answer)
0.5 ohms

Correct answer: 0.1 ohms

NFPA 99 requires receptacle ground resistance to not exceed 0.1 ohms in patient care areas to ensure electrical safety.

Question 26: An infusion pump alarms 'upstream occlusion' but the tubing appears clear. What should the BMET check next?

Software version of the pump firmware
IV bag height relative to the patient
Closed roller clamp or kinked tubing upstream of the pump (Correct answer)
Battery level of the pump

Correct answer: Closed roller clamp or kinked tubing upstream of the pump

A closed clamp or subtle kink upstream of the pump head is the most frequent cause of upstream occlusion alarms when visible tubing appears unobstructed.

Question 27: A portable X-ray unit's collimator is found to be misaligned during PM. Why is this clinically significant?

It overheats the X-ray tube
It makes images appear blurry
It increases patient dose to the intended field only
Misalignment exposes patients to unnecessary radiation outside the intended field (Correct answer)

Correct answer: Misalignment exposes patients to unnecessary radiation outside the intended field

Collimator misalignment means the radiation field does not match the light field, potentially exposing unintended anatomy and violating ALARA principles.

Question 28: When troubleshooting a pulse oximeter that is giving an erratic SpO2 reading, the CBET should understand that the device's measurement principle is based on the absorption of light by what substance in the blood?

White blood cells
Plasma
Hemoglobin (Correct answer)
Platelets

Correct answer: Hemoglobin

Pulse oximeters work by passing red and infrared light through a capillary bed and measuring the differential absorption. The amount of light absorbed is dependent on the oxygenation level of hemoglobin, the protein in red blood cells that carries oxygen.

Question 29: What does the term 'equipotential grounding' mean in the context of a hospital operating room?

All equipment is powered from the same circuit breaker
All equipment uses the same voltage level
All conductive surfaces within patient reach are connected to a common ground point (Correct answer)
All ground wires are the same length

Correct answer: All conductive surfaces within patient reach are connected to a common ground point

Equipotential grounding ensures that all conductive surfaces within patient reach are bonded to a single ground reference point, eliminating dangerous potential differences.

Question 30: What does the term 'blended mode' refer to in electrosurgical unit operation?

A combination of cut and coagulation waveforms that provides simultaneous cutting and hemostasis (Correct answer)
Alternating between two different frequency settings
Mixing saline with the electrosurgical current
Using both monopolar and bipolar modes simultaneously

Correct answer: A combination of cut and coagulation waveforms that provides simultaneous cutting and hemostasis

Blend mode modulates the duty cycle of the cutting waveform to add hemostatic coagulation while still cutting tissue.

Question 31: In a 3-phase electrical system supplying medical imaging equipment, an open neutral conductor would MOST likely cause:

Increased ground fault current
Reduced power consumption by the equipment
Overvoltage on some phases damaging connected equipment (Correct answer)
Nuisance tripping of circuit breakers

Correct answer: Overvoltage on some phases damaging connected equipment

An open neutral in a 3-phase system causes voltage imbalance, resulting in overvoltage on some phases that can damage connected equipment.

Question 32: What principle does an ultrasound imaging system use to create images of internal body structures?

Ionizing radiation absorption
Infrared thermal detection
Magnetic resonance of hydrogen atoms
Piezoelectric transducer emitting and receiving high-frequency sound waves (Correct answer)

Correct answer: Piezoelectric transducer emitting and receiving high-frequency sound waves

Ultrasound uses piezoelectric transducers to emit high-frequency sound waves and detect reflected echoes to create real-time images.

Question 33: In a bulk liquid oxygen system, what safety device prevents overpressure in the storage vessel?

Backflow preventer
Pressure relief valve (Correct answer)
Zone valve
Check valve

Correct answer: Pressure relief valve

Pressure relief valves are required on bulk liquid oxygen storage vessels to vent excess pressure and prevent catastrophic failure.

Question 34: What is the purpose of a VLAN in a hospital network?

To increase internet bandwidth
To logically segment network traffic for security and performance (Correct answer)
To encrypt all network data
To provide wireless coverage

Correct answer: To logically segment network traffic for security and performance

A VLAN logically segments a physical network into separate broadcast domains, improving security by isolating medical device traffic.

Question 35: A hospital's isolated power system (IPS) is designed primarily to protect against:

Power surges from the utility grid
Electromagnetic interference from adjacent equipment
Macroshock from single-fault ground currents in wet locations (Correct answer)
Overloading of the facility's main circuit breakers

Correct answer: Macroshock from single-fault ground currents in wet locations

An IPS isolates the patient care circuit from ground so a single fault does not create a complete circuit for dangerous ground currents (macroshock).

Question 36: A defibrillator delivers only 150 J when set to 200 J during an output verification test. After replacing the energy storage capacitor the problem persists. What should be investigated next?

Front-panel display calibration
Charging circuit and charge relay (Correct answer)
Patient cable integrity
Battery voltage under load

Correct answer: Charging circuit and charge relay

If the capacitor is confirmed good, the charging circuit or charge relay is the next most likely cause of low delivered energy.

Question 37: What is the FDA's role regarding medical devices and what is the 510(k) clearance process?

The FDA manufactures medical devices
510(k) is a hospital quality process
The FDA regulates safety and effectiveness; 510(k) demonstrates substantial equivalence to a predicate device (Correct answer)
The FDA only regulates drugs

Correct answer: The FDA regulates safety and effectiveness; 510(k) demonstrates substantial equivalence to a predicate device

The FDA regulates medical devices; 510(k) requires demonstrating substantial equivalence to a legally marketed device.

Question 38: A biomedical equipment technician is performing an electrical safety inspection on a portable medical device. The resistance measurement between the ground pin of the attachment plug and the device's metal chassis should be less than what value to be considered safe?

0.1 ohms
5.0 ohms
0.5 ohms (Correct answer)
1.0 ohm

Correct answer: 0.5 ohms

To ensure a reliable path to earth ground in case of a fault, the resistance between the chassis and the ground pin of the power cord must be very low. According to NFPA 99, this resistance must be less than 0.5 ohms. A low-resistance ground path is critical for shunting fault currents safely to the ground, preventing the chassis from becoming energized.

Question 39: A Zener diode is primarily used in electronic circuits to:

Rectify AC to DC
Amplify small signals
Regulate voltage (Correct answer)
Filter high-frequency noise

Correct answer: Regulate voltage

Zener diodes operate in reverse breakdown to maintain a stable reference voltage, making them ideal for voltage regulation.

Question 40: Which FDA regulation class typically applies to life-sustaining devices such as pacemakers, requiring the highest level of regulatory control?

Class III (Correct answer)
Class IV
Class I
Class II

Correct answer: Class III

FDA Class III devices are life-sustaining or life-supporting devices subject to the most stringent regulatory controls, including premarket approval (PMA).

Question 41: In ultrasound imaging, what physical principle allows tissue boundaries to be visualized?

Fluorescence under UV light
Nuclear magnetic resonance
Reflection of sound waves at acoustic impedance mismatches (Correct answer)
Absorption of X-ray photons

Correct answer: Reflection of sound waves at acoustic impedance mismatches

Sound waves reflect at interfaces between tissues of different acoustic impedance; the transducer detects these echoes to reconstruct an image.

Question 42: When a BIOMED technician validates a new sterilizer installation, which test must be performed to confirm steam quality?

Biological indicator test only
Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ) (Correct answer)
Superheat test only
Bowie-Dick test only

Correct answer: Installation Qualification (IQ), Operational Qualification (OQ), and Performance Qualification (PQ)

FDA and AAMI standards require IQ, OQ, and PQ validation for sterilizer installation to confirm equipment is installed correctly, operates within specifications, and performs consistently.

Question 43: A portable X-ray unit fails to produce an exposure when triggered. The BMET confirms the battery is fully charged. What should be checked next?

Collimator lamp
High-voltage transformer primary winding
Focal spot size
Handswitch and exposure control circuitry (Correct answer)

Correct answer: Handswitch and exposure control circuitry

The handswitch and exposure control circuit initiate the exposure sequence; a fault here will prevent triggering even with adequate power.

Question 44: To verify that a defibrillator is delivering the correct amount of energy and that its waveform characteristics are within specifications, a BMET must use which specialized piece of test equipment?

A defibrillator/pacer analyzer. (Correct answer)
An oscilloscope with a high-voltage probe.
An electrical safety analyzer.
A digital multimeter with a peak-hold function.

Correct answer: A defibrillator/pacer analyzer.

A defibrillator/pacer analyzer is a specialized instrument that presents a specific resistive load (typically 50 ohms) to the defibrillator and precisely measures the delivered energy in Joules. It is also designed to analyze key waveform parameters like pulse duration and current, which cannot be done with the other listed devices.

Question 45: A pulse oximeter uses two wavelengths of light — typically 660 nm (red) and 940 nm (infrared). Why are these two specific wavelengths chosen?

Oxyhemoglobin and deoxyhemoglobin have opposite absorbance ratios at these wavelengths, enabling their proportional calculation (Correct answer)
These wavelengths avoid interference from skin melanin, which absorbs all other visible light
They penetrate skin to different depths, allowing tissue depth profiling
660 nm activates the photodetector and 940 nm is the reference channel

Correct answer: Oxyhemoglobin and deoxyhemoglobin have opposite absorbance ratios at these wavelengths, enabling their proportional calculation

At 660 nm, deoxyhemoglobin (HbR) absorbs much more light than oxyhemoglobin (HbO₂). At 940 nm, the relationship reverses — HbO₂ absorbs more. By comparing the ratio of absorbances at both wavelengths, the SpO₂ algorithm can calculate the proportion of oxygenated to total hemoglobin. This isobestic-point straddling technique is the foundation of pulse oximetry.

Question 46: What is the primary biological indicator used to validate steam sterilization processes?

Bacillus subtilis spores
Clostridium sporogenes spores
Geobacillus stearothermophilus spores (Correct answer)
Bacillus cereus spores

Correct answer: Geobacillus stearothermophilus spores

Geobacillus stearothermophilus is the most resistant organism to moist heat and is the standard biological indicator for steam sterilization validation.

Question 47: What is the purpose of a snubber circuit across relay contacts in medical equipment?

To provide visual indication of relay state
To suppress voltage spikes caused by inductive load switching (Correct answer)
To increase switching speed of the relay
To reduce power consumption of the relay coil

Correct answer: To suppress voltage spikes caused by inductive load switching

A snubber circuit suppresses voltage transients generated when relay contacts open and interrupt current to an inductive load.

Question 48: The sinoatrial (SA) node is located in which chamber of the heart?

Left ventricle
Right ventricle
Left atrium
Right atrium (Correct answer)

Correct answer: Right atrium

The SA node, often called the heart's natural pacemaker, is located in the upper wall of the right atrium near the superior vena cava opening.

Question 49: A washer-disinfector used for surgical instrument reprocessing must achieve what temperature during the thermal disinfection phase to meet A0 600 standard?

71°C for 3 minutes
80°C for 10 minutes
90°C for 1 minute (Correct answer)
60°C for 1 minute

Correct answer: 90°C for 1 minute

An A0 value of 600 can be achieved at 90°C for 1 minute, which is the thermal disinfection threshold meeting ISO 15883 standards.

Question 50: A C-arm fluoroscopy unit drifts out of position during a procedure. Which component is most likely responsible?

X-ray tube filament
Brake or locking mechanism on the C-arm carriage (Correct answer)
Collimator shutter
Image intensifier phosphor layer

Correct answer: Brake or locking mechanism on the C-arm carriage

A faulty brake or locking mechanism allows unintended movement of the C-arm, causing positional drift during procedures.

Question 51: What does a 'risk-based PM program' use to prioritize maintenance frequency?

Manufacturer name
Device criticality, failure consequences, and maintenance history (Correct answer)
Purchase price only
Room location alphabetically

Correct answer: Device criticality, failure consequences, and maintenance history

Risk-based programs assign higher PM priority to life-sustaining or high-risk devices and extend intervals for low-risk equipment with good histories.

Question 52: What does NFPA 99 cover and why is it important for biomedical technicians?

Pharmaceutical manufacturing standards
Healthcare facility requirements for electrical systems, medical gas systems, vacuum systems, and other building systems (Correct answer)
Fire extinguisher schedules only
Food preparation safety in hospitals

Correct answer: Healthcare facility requirements for electrical systems, medical gas systems, vacuum systems, and other building systems

NFPA 99 establishes criteria for safeguarding patients from fire, explosion, electrical hazards, and medical gas hazards.

Question 53: An infusion pump displays a 'door open' alarm even though the door is fully closed and latched. What troubleshooting approach should you take first?

Replace the IV tubing set
Inspect the door latch mechanism and door switch for mechanical wear or debris (Correct answer)
Replace the entire pump
Update the pump firmware

Correct answer: Inspect the door latch mechanism and door switch for mechanical wear or debris

A false 'door open' alarm indicates the door switch or latch mechanism is not properly activating when closed.

Question 54: The FDA issues a recall for a medical device because its use presents a reasonable probability of causing serious adverse health consequences or death. How would this recall be classified?

Class II
Class A
Class I (Correct answer)
Class III

Correct answer: Class I

The FDA classifies recalls into three categories. A Class I recall is the most serious type, used when there is a reasonable probability that the use of or exposure to a violative product will cause serious adverse health consequences or death.

Question 55: The functional unit of the kidney responsible for filtering waste products from the blood and producing urine is the:

Alveolus
Villus
Nephron (Correct answer)
Neuron

Correct answer: Nephron

The nephron is the microscopic structural and functional unit of the kidney. Its primary function is to regulate the concentration of water and soluble substances like sodium salts by filtering the blood, reabsorbing what is needed, and excreting the rest as urine. This is relevant for understanding the principles behind dialysis equipment.

Question 56: Which type of chemical indicator confirms that a package was exposed to sterilization conditions, not just that sterilization was achieved?

Class 5 integrating indicator
Class 6 emulating indicator
Class 1 process indicator (Correct answer)
Biological indicator

Correct answer: Class 1 process indicator

Class 1 process indicators (e.g., autoclave tape) only show that an item was processed; they do not confirm sterilization conditions were met.

Question 57: Thermal runaway in a bipolar junction transistor (BJT) is caused by:

Positive feedback between temperature rise and collector current increase (Correct answer)
Capacitive coupling between collector and base
Breakdown of the emitter-base junction at low voltages
Excessive base current limiting resistance

Correct answer: Positive feedback between temperature rise and collector current increase

As a BJT heats up, leakage current increases, raising collector current which generates more heat, creating a destructive positive feedback loop.

Question 58: Which structure in the brain is responsible for regulating body temperature, hunger, and thirst?

Medulla oblongata
Cerebral cortex
Cerebellum
Hypothalamus (Correct answer)

Correct answer: Hypothalamus

The hypothalamus is a small region at the base of the brain that regulates many homeostatic functions including body temperature, hunger, thirst, and circadian rhythms.

Question 59: A BMET is tasked with decommissioning several old patient monitors that contain ePHI. Under the HIPAA Security Rule's Physical Safeguards, which standard specifically addresses the proper handling of this task?

Workstation Use
Contingency Operations
Facility Access Controls
Device and Media Controls (Correct answer)

Correct answer: Device and Media Controls

The HIPAA Security Rule's Physical Safeguards include the 'Device and Media Controls' standard. This standard requires covered entities to implement policies and procedures for the secure movement, removal, disposal, and re-use of electronic media and hardware that contains electronic Protected Health Information (ePHI).

Question 60: In a PACS (Picture Archiving and Communication System), what standard protocol is used to transfer images?

HL7 v2
TCP/IP only
DICOM (Digital Imaging and Communications in Medicine) (Correct answer)
IEEE 802.11

Correct answer: DICOM (Digital Imaging and Communications in Medicine)

DICOM is the universal standard for storing, transmitting, and displaying medical images across modalities and systems.

Question 61: In a pulse oximeter, which physiological principle is used to differentiate oxygenated from deoxygenated hemoglobin?

Measurement of blood pressure waveform morphology
Differential light absorption at two wavelengths (660 nm and 940 nm) (Correct answer)
Impedance plethysmography across the finger
Detection of CO2 partial pressure via infrared spectroscopy

Correct answer: Differential light absorption at two wavelengths (660 nm and 940 nm)

Pulse oximeters exploit the fact that oxyhemoglobin and deoxyhemoglobin absorb red (660 nm) and infrared (940 nm) light at different ratios.

Question 62: What is the purpose of the central monitoring station in a patient monitoring system?

To control all medical equipment
To store all hospital medical records
To display and monitor multiple patients' vital signs simultaneously from a central location (Correct answer)
To manage medication dispensing

Correct answer: To display and monitor multiple patients' vital signs simultaneously from a central location

A central station receives and displays real-time vital signs from multiple bedside monitors for simultaneous observation.

Question 63: What does the term 'duty cycle' refer to in the context of an electrosurgical unit?

The percentage of power output relative to maximum
The percentage of time the device is powered on per day
The ratio of active current delivery time to total cycle time, which differentiates cutting from coagulation modes (Correct answer)
The number of procedures before maintenance

Correct answer: The ratio of active current delivery time to total cycle time, which differentiates cutting from coagulation modes

CUT mode uses continuous waveform (100% duty cycle) for tissue vaporization; COAGULATION uses intermittent waveform (6% duty cycle) for protein denaturation.

Question 64: Under HIPAA's Security Rule, which control specifically addresses ensuring that ePHI transmitted over a network cannot be improperly modified without detection?

Transmission integrity (Correct answer)
Person authentication
Access control
Audit controls

Correct answer: Transmission integrity

Transmission integrity controls verify that ePHI is not altered or destroyed in an unauthorized manner during network transmission.

Question 65: A new infusion pump is delivered to the hospital. The specifications state it uses a peristaltic mechanism. How does this type of pump move fluid through the IV tubing?

By using gravity and controlling the flow with a simple roller clamp.
By using rotating rollers or 'fingers' to sequentially compress the tubing. (Correct answer)
By creating a pressure differential with a vacuum system.
By using a motor to precisely advance a plunger within a syringe.

Correct answer: By using rotating rollers or 'fingers' to sequentially compress the tubing.

Peristaltic pumps function by using a set of rotating rollers that press against a flexible tube. As the rollers move along the tube, they create a pocket of fluid that is pushed forward, mimicking the biological process of peristalsis. This mechanism allows for controlled fluid delivery without the pump's components directly contacting the fluid.

Question 66: During a risk assessment of a networked infusion pump, the BIOMED technician identifies that the device uses Telnet for remote management. What is the primary security concern?

Telnet cannot be used on medical networks
Telnet transmits data including credentials in plaintext (Correct answer)
Telnet is incompatible with IPv6
Telnet uses too much bandwidth

Correct answer: Telnet transmits data including credentials in plaintext

Telnet sends all data, including usernames and passwords, as unencrypted plaintext, making it vulnerable to eavesdropping.

Question 67: Which tool is used to measure ground wire resistance during electrical safety testing?

Electrical safety analyzer (Correct answer)
Clamp meter only
Standard digital multimeter
Hipot tester

Correct answer: Electrical safety analyzer

An electrical safety analyzer (such as a Fluke or Rigel unit) measures ground resistance, leakage currents, and line voltage in one instrument.

Question 68: A BMET discovers that a ventilator's power cord has a damaged third prong (ground pin). The BEST immediate action is to:

Tape the cord and return the device to service
Tag the device out of service and remove it from clinical use (Correct answer)
Continue using the device since the ground is a redundant safety measure
Use a two-prong adapter until repairs can be scheduled

Correct answer: Tag the device out of service and remove it from clinical use

A damaged ground pin creates a shock hazard; the device must be immediately taken out of service, tagged, and repaired before returning to clinical use.

Question 69: Which JCAHO/TJC standard requires hospitals to maintain a medical equipment management plan?

PC.04.02.01
IC.01.03.01
EC.02.04.01 (Correct answer)
RC.01.02.01

Correct answer: EC.02.04.01

TJC standard EC.02.04.01 requires organizations to manage medical equipment risks through an equipment management program including PM and inspection.

Question 70: A hospital's IDS generates an alert when a networked vital signs monitor begins scanning other IP addresses on the LAN. What type of attack does this behavior most likely indicate?

DNS poisoning
Denial of Service (DoS)
Lateral movement / network reconnaissance (Correct answer)
Ransomware encryption

Correct answer: Lateral movement / network reconnaissance

Port/IP scanning from a compromised device indicates an attacker performing network reconnaissance to identify additional targets for lateral movement.

Question 71: Which NFPA 99 requirement applies specifically to wet locations in healthcare facilities such as hydrotherapy areas?

Receptacles must be red to indicate emergency power
GFCI protection is required for all receptacles (Correct answer)
Only 240V receptacles are permitted
All receptacles must be isolated ground type

Correct answer: GFCI protection is required for all receptacles

NFPA 99 requires GFCI protection on all receptacles in wet procedure locations to reduce electrocution risk in areas where water is routinely present.

Question 72: On a mammography unit, the automatic exposure control (AEC) sensor is placed:

Between the X-ray tube and the breast
Inside the compression paddle
Behind the image receptor, in the beam exit path (Correct answer)
Adjacent to the collimator assembly

Correct answer: Behind the image receptor, in the beam exit path

The mammography AEC detector is positioned behind (distal to) the image receptor so it samples the transmitted beam to terminate exposure at the correct dose.

Question 73: In a hospital electrical system, what is the purpose of an isolation transformer in an isolated power system?

To increase available current capacity
To convert AC to DC power
To prevent ground-fault current from flowing through patients (Correct answer)
To step down voltage for equipment

Correct answer: To prevent ground-fault current from flowing through patients

An isolation transformer prevents ground-fault current from flowing through patients by electrically isolating the secondary circuit from ground.

Question 74: What is the purpose of the return electrode monitoring (REM) system on an electrosurgical unit?

To monitor the surgeon's hand position
To continuously verify adequate contact of the dispersive electrode pad to prevent burns (Correct answer)
To control cutting depth
To measure total energy delivered

Correct answer: To continuously verify adequate contact of the dispersive electrode pad to prevent burns

REM monitors impedance between the split-pad sections, alarming and disabling output if contact degrades.

Question 75: During a preventive maintenance inspection, an electrosurgical unit's leakage current measures 450 µA chassis to ground. What action is required?

Report to nursing and continue normal use
Install an additional ground wire and retest
Remove from service; leakage exceeds the 300 µA limit for ESUs (Correct answer)
Return to service; the reading is within acceptable limits

Correct answer: Remove from service; leakage exceeds the 300 µA limit for ESUs

NFPA 99 and AAMI ES60601-1 limit chassis leakage current to 300 µA for patient-care equipment; 450 µA requires the unit be taken out of service.

Question 76: Which unit describes the absorbed radiation dose in diagnostic imaging?

Sievert (Sv)
Roentgen (R)
Becquerel (Bq)
Gray (Gy) (Correct answer)

Correct answer: Gray (Gy)

The Gray (Gy) is the SI unit of absorbed dose, equal to 1 joule of energy deposited per kilogram of tissue.

Question 77: A BMET is performing electrical safety testing on a device and measures patient leakage current that exceeds allowable limits under ANSI/AAMI ES60601-1. The MOST appropriate next step is to:

Return the device to service and schedule follow-up testing in 30 days
Remove the device from service, document findings, and initiate repair before return to use (Correct answer)
Increase the ground resistance to compensate for the high leakage
Notify only the nursing staff and let them decide on continued use

Correct answer: Remove the device from service, document findings, and initiate repair before return to use

A device that fails electrical safety testing must be removed from service immediately, the failure documented, and the device repaired and retested before being returned to patient use.

Question 78: Which organization publishes ANSI/AAMI standards relevant to biomedical equipment maintenance in the US?

Centers for Medicare & Medicaid Services (CMS)
Occupational Safety and Health Administration (OSHA)
Association for the Advancement of Medical Instrumentation (AAMI) (Correct answer)
American Dental Association (ADA)

Correct answer: Association for the Advancement of Medical Instrumentation (AAMI)

AAMI publishes consensus standards and technical information reports widely used by biomedical engineers for equipment maintenance and safety.

Question 79: In a hemodialysis machine, the dialysate flow direction relative to blood flow is typically:

Intermittent, alternating direction every five minutes
Co-current, to prevent pressure differentials across the membrane
Countercurrent, to maximize the concentration gradient for diffusion across the dialyzer membrane (Correct answer)
Perpendicular, to promote ultrafiltration only

Correct answer: Countercurrent, to maximize the concentration gradient for diffusion across the dialyzer membrane

Countercurrent flow maintains a favorable concentration gradient along the entire length of the dialyzer, maximizing solute clearance.

Question 80: Which document typically defines the required PM interval for a medical device in a US hospital?

State pharmacy license
Patient intake form
Hospital billing records
Manufacturer's service manual (Correct answer)

Correct answer: Manufacturer's service manual

The manufacturer's service manual specifies recommended PM intervals and procedures that biomed departments use to build their maintenance schedules.

Question 81: During an electrical safety test, a patient monitor passes all leakage current tests under normal conditions but fails under single-fault (open ground) condition. What does this indicate?

The safety analyzer is malfunctioning
The device has adequate basic insulation but relies on the ground connection for safety - internal insulation may be degrading (Correct answer)
The device is safe to use as-is
The device needs a new power cord only

Correct answer: The device has adequate basic insulation but relies on the ground connection for safety - internal insulation may be degrading

Passing under normal conditions but failing under open ground indicates internal insulation degradation that the ground path currently compensates for.

Question 82: An electrosurgical unit (ESU) is being used in monopolar mode. For the electrical circuit to function correctly and safely, which component is essential to complete the circuit by returning the current to the generator?

An active electrode with a smaller tip
A dispersive patient return electrode (Correct answer)
An isolated power system
A bipolar forceps attachment

Correct answer: A dispersive patient return electrode

In monopolar electrosurgery, the electrical current flows from the active electrode, through the patient's body to the surgical site, and then must be safely returned to the ESU generator. A large dispersive pad, known as the patient return electrode, is placed on the patient's body away from the surgical site to collect the current and complete the circuit, preventing burns at unintended sites.

Question 83: A laboratory centrifuge is producing excessive vibration during operation. What is the most likely cause and what safety risk does this present?

The centrifuge needs lubrication only
The power supply voltage is too high
Imbalanced sample loading or worn rotor bearings, which risks rotor failure and projectile release (Correct answer)
The display panel is malfunctioning

Correct answer: Imbalanced sample loading or worn rotor bearings, which risks rotor failure and projectile release

Excessive vibration results from imbalanced samples or worn bearings, creating a serious risk of catastrophic rotor failure.

Question 84: A patient monitor displays an artifact that disappears when the patient's lead wires are disconnected. This MOST likely indicates:

EMI from external sources coupling through the leads (Correct answer)
A faulty amplifier in the monitor
Software corruption in the monitor
A defective power supply

Correct answer: EMI from external sources coupling through the leads

When artifact disappears upon lead disconnection, the leads are acting as antennas picking up electromagnetic interference from external sources.

Question 85: During PM on an electrocoagulation unit, the output power is measured 15% below the displayed setting. Which step should the technician perform next?

Tag the device out of service immediately
Increase the generator voltage supply rail
Replace the RF output transformer
Adjust the internal power calibration potentiometer per service manual (Correct answer)

Correct answer: Adjust the internal power calibration potentiometer per service manual

A 15% power output deviation is within the range correctable by internal calibration adjustment before component replacement is warranted.

Question 86: Which NFPA 99 health care facility category requires the highest level of medical gas system redundancy and emergency backup?

Category 2
Category 1 (Correct answer)
Category 4
Category 3

Correct answer: Category 1

Category 1 facilities (e.g., operating rooms, ICUs) require the highest redundancy because failure of equipment could cause major injury or death.

Question 87: What is a medical gas manifold system and how does it ensure continuous gas supply?

A pressure boosting system
A single large cylinder connected directly to the pipeline
A dual-bank arrangement of cylinders with automatic switchover between primary and reserve banks (Correct answer)
A mixing chamber that combines multiple gases

Correct answer: A dual-bank arrangement of cylinders with automatic switchover between primary and reserve banks

A manifold uses two banks with automatic switchover to ensure uninterrupted supply.

Question 88: What does the term 'SAL 10⁻⁶' mean in the context of sterilization?

There is a 1 in 100,000 chance of a viable organism on a device
The sterilizer kills 10⁶ organisms per minute
10⁶ organisms were present before sterilization
There is a 1 in 1,000,000 chance of a viable organism on a device (Correct answer)

Correct answer: There is a 1 in 1,000,000 chance of a viable organism on a device

A Sterility Assurance Level of 10⁻⁶ means there is a 1 in 1,000,000 probability that a viable microorganism remains on a sterilized item.

Question 89: Which OSHA standard most directly governs healthcare worker safety when handling ethylene oxide sterilizers?

29 CFR 1910.1030 (Bloodborne Pathogens)
29 CFR 1910.1200 (Hazard Communication)
29 CFR 1910.1047 (Ethylene Oxide Standard) (Correct answer)
29 CFR 1910.134 (Respiratory Protection)

Correct answer: 29 CFR 1910.1047 (Ethylene Oxide Standard)

OSHA 29 CFR 1910.1047 specifically regulates occupational exposure to ethylene oxide, including permissible exposure limits, monitoring, and worker protections.

Question 90: In an op-amp configured as an inverting amplifier with Rf = 100 kΩ and Rin = 10 kΩ, the voltage gain is:

+10
+0.1
-10 (Correct answer)
-0.1

Correct answer: -10

The inverting amplifier gain is -Rf/Rin = -100kΩ/10kΩ = -10, where the negative sign indicates phase inversion.

Question 91: A hospital is implementing a new fleet of infusion pumps that will integrate directly with the EHR. To ensure the confidentiality and integrity of the patient data being transmitted wirelessly, which of the following security measures is MOST critical?

Assigning static IP addresses
Implementing WPA2/WPA3 encryption (Correct answer)
Physical locks on the devices
Disabling all audible alarms

Correct answer: Implementing WPA2/WPA3 encryption

WPA2 (Wi-Fi Protected Access 2) and its successor, WPA3, are security protocols that encrypt wireless network traffic. This is essential to protect electronic Protected Health Information (ePHI) from being intercepted, as required by the HIPAA Security Rule. Physical locks prevent theft but not data interception. Alarms and IP addressing methods are not primary data security measures.

Question 92: A Safe Medical Devices Act (SMDA) requirement obligates hospitals to report device-related serious injuries to:

Both the FDA and the device manufacturer (Correct answer)
The state health department only
The hospital's risk management department only
The Joint Commission only

Correct answer: Both the FDA and the device manufacturer

Under the SMDA, user facilities must report serious injuries caused by medical devices to both the FDA and the manufacturer within 10 working days.

Question 93: A hemodialysis machine is being used to treat a patient with renal failure. The primary mechanism by which waste products like urea are removed from the blood into the dialysate is:

Convection
Diffusion (Correct answer)
Osmosis
Ultrafiltration

Correct answer: Diffusion

Hemodialysis primarily relies on diffusion to remove metabolic waste products. These substances, like urea, are in high concentration in the patient's blood and move across the semipermeable dialyzer membrane into the dialysate, where their concentration is low or zero. Ultrafiltration is the primary method for fluid removal, not solute removal.

Question 94: A hospital laboratory centrifuge vibrates excessively during operation. The MOST likely cause is:

Motor bearing wear causing rotor imbalance
An unbalanced load due to improperly paired or misplaced samples (Correct answer)
A failed tachometer sensor
Excessive ambient temperature in the lab

Correct answer: An unbalanced load due to improperly paired or misplaced samples

Centrifuges must have balanced loads; unequal or improperly positioned samples create centrifugal force imbalance causing severe vibration.

Question 95: What is the correct term for the process of reducing microbial contamination to a safe level without achieving sterility?

Sterilization
Disinfection (Correct answer)
Decontamination
Antisepsis

Correct answer: Disinfection

Disinfection reduces the number of viable microorganisms to a level considered safe for handling but does not necessarily eliminate all spores.

Question 96: What is a telemetry monitoring system and how does it differ from bedside monitoring?

Telemetry uses portable wireless transmitters on ambulatory patients, sending ECG data to a central station (Correct answer)
Telemetry only works in operating rooms
Telemetry is more accurate
Telemetry uses wired connections

Correct answer: Telemetry uses portable wireless transmitters on ambulatory patients, sending ECG data to a central station

Telemetry uses small portable wireless transmitters enabling continuous monitoring while patients walk around.

Question 97: Which component in an X-ray tube is the source of electrons?

Glass envelope
Cathode filament (Correct answer)
Anode disc
Rotor bearing

Correct answer: Cathode filament

The cathode filament is heated by current until thermionic emission releases electrons, which are then accelerated toward the anode.

Question 98: What does 'equipment management inventory' primarily track in a biomed program?

Patient discharge times
Hospital supply chain pricing
Every device's location, PM schedule, and service history (Correct answer)
Staff vacation schedules

Correct answer: Every device's location, PM schedule, and service history

A complete inventory ties each device to its asset number, location, PM due date, and maintenance history to ensure no device is missed.

Question 99: A patient-controlled analgesia (PCA) pump must include which safety feature to prevent accidental overdose?

An automatic increase in dose when the patient presses the button repeatedly
A variable drip rate adjusted by nursing staff every hour
A lockout interval that disables bolus delivery for a set time after each dose (Correct answer)
A pressure sensor that detects IV line occlusion only

Correct answer: A lockout interval that disables bolus delivery for a set time after each dose

The lockout interval enforces a mandatory waiting period between boluses, preventing the patient from receiving dangerous cumulative doses.

Question 100: In a full-wave bridge rectifier with four diodes, the output ripple frequency relative to the AC input frequency is:

Four times (4×)
Half (0.5×)
Double (2×) (Correct answer)
Equal (1×)

Correct answer: Double (2×)

A full-wave bridge rectifier conducts on both half-cycles, producing two output pulses per input cycle, doubling the ripple frequency.

Question 101: Which of the following aspects of healthcare is under the primary control of the Centers for Medicare and Medicaid Services (CMS)?

Accreditation and certification of healthcare facilities
Overseeing healthcare insurance for small businesses and individuals (Correct answer)
Accrediting research laboratories
Publication of standards for quality improvement in organizations

Correct answer: Overseeing healthcare insurance for small businesses and individuals

The Centers for Medicare & Medicaid Services (CMS) is a federal agency responsible for administering the Medicare program and working with states to manage Medicaid, the Children's Health Insurance Program (CHIP), and health insurance marketplaces. Its primary control lies in overseeing these vast government healthcare programs, which provide health coverage to millions of Americans, including those in small businesses and individuals through the Affordable Care Act (ACA) marketplaces.

Question 102: Which safety system is specifically designed to prevent the accidental connection of the wrong gas-specific flowmeter or hose to a medical gas wall outlet?

Diameter Index Safety System (DISS) (Correct answer)
Color Coding System
Compressed Gas Association (CGA) fitting
Pin Index Safety System (PISS)

Correct answer: Diameter Index Safety System (DISS)

The Diameter Index Safety System (DISS) uses non-interchangeable, gas-specific threaded connections on wall outlets and equipment to prevent misconnections. Each gas service has a unique set of diameters on the connector body and nipple, making it physically impossible to connect equipment for one gas to the outlet of another. PISS is used for small gas cylinders, not wall outlets.

Question 103: When testing a line isolation monitor (LIM), the alarm should activate when the hazard current exceeds:

10 mA
2 mA
1 mA
5 mA (Correct answer)

Correct answer: 5 mA

NFPA 99 requires the LIM alarm to activate when total hazard current reaches 5 mA, indicating the IPS isolation has degraded to a dangerous level.

Question 104: According to electrical safety standards, the ground wire in a medical device power cord must be:

The same gauge as the hot conductor (Correct answer)
Connected to the chassis only, not the plug ground pin
A larger gauge than the hot and neutral conductors
Optional if a double-insulated design is used

Correct answer: The same gauge as the hot conductor

The equipment ground conductor must be at least the same gauge as the current-carrying conductors to safely carry fault current.

Question 105: A steam autoclave cycle completes and the physical monitors (temperature and pressure graphs) indicate all parameters were met. However, a biological indicator (BI) test from the load subsequently fails (shows growth). Which of the following is the MOST probable cause?

The chamber pressure sensor is out of calibration.
The autoclave's door gasket is leaking.
The heating element has completely failed.
The load was too dense or improperly packed, creating air pockets. (Correct answer)

Correct answer: The load was too dense or improperly packed, creating air pockets.

When physical monitors show a successful cycle but the BI fails, it often points to a steam penetration issue rather than an equipment malfunction. Overloading the chamber or packing items too densely can create air pockets that prevent steam from contacting the BI, thus allowing the heat-resistant spores to survive even though the chamber itself reached the correct temperature and pressure.

Question 106: What is the primary hazard associated with improper grounding of a surgical robot in the OR?

Vision system latency will increase
Instrument servo motors may stall
Leakage current could flow through the patient, causing burns or cardiac events (Correct answer)
Robot positional accuracy will degrade

Correct answer: Leakage current could flow through the patient, causing burns or cardiac events

Improper grounding of electrically powered equipment in the OR can create leakage current paths through the patient, posing serious electrical safety risks.

Question 107: A patient monitor's ECG trace shows excessive 60 Hz artifact despite proper lead placement. After checking lead connections, what is the next troubleshooting step?

Switch the monitor to a different electrical outlet
Verify patient ground electrode contact and integrity (Correct answer)
Replace the ECG module
Increase the filter bandwidth setting

Correct answer: Verify patient ground electrode contact and integrity

Poor or absent ground (RL/right-leg drive) electrode contact is the most common cause of persistent 60 Hz powerline interference on ECG.

Question 108: What is the minimum concentration of glutaraldehyde required for high-level disinfection of semicritical medical devices?

3.5%
2.0% (Correct answer)
0.5%
1.0%

Correct answer: 2.0%

A minimum concentration of 2% glutaraldehyde is required to achieve high-level disinfection within the recommended contact time.

Question 109: Under the Health Insurance Portability and Accountability Act (HIPAA), a BMET who accesses patient data stored on a medical device must:

Encrypt and email data to the device manufacturer for analysis
Report all accessed data to the hospital's compliance officer
Access only the minimum necessary information and follow facility data handling policies (Correct answer)
Copy the data for equipment maintenance records

Correct answer: Access only the minimum necessary information and follow facility data handling policies

HIPAA's minimum necessary standard requires workforce members to access only the protected health information needed to perform their job function.

Question 110: When testing electrical safety with a safety analyzer, the 'patient lead to ground' leakage test measures current flowing from:

Applied parts to the equipment ground (Correct answer)
The power line to the chassis
The chassis to the neutral conductor
The power cord ground pin to chassis

Correct answer: Applied parts to the equipment ground

Patient lead-to-ground leakage measures current that could flow through a patient from applied parts to ground, reflecting direct patient risk.

Question 111: A pulse oximeter reads 98% SpO2 but the patient appears cyanotic. Which condition MOST likely explains this discrepancy?

Motion artifact from patient tremors
Hypothermia reducing peripheral perfusion
Anemia with normal oxygen saturation
Carbon monoxide poisoning causing carboxyhemoglobin (Correct answer)

Correct answer: Carbon monoxide poisoning causing carboxyhemoglobin

Pulse oximetry cannot distinguish carboxyhemoglobin from oxyhemoglobin, so CO poisoning produces falsely elevated SpO2 readings despite true hypoxia.

Question 112: In Pressure-Controlled Ventilation (PCV), what variable is directly set by the clinician and remains constant despite changes in the patient's lung mechanics?

Inspiratory pressure above PEEP (Correct answer)
Tidal volume delivered
Peak inspiratory flow rate
Minute ventilation

Correct answer: Inspiratory pressure above PEEP

In PCV, the ventilator delivers gas until the set inspiratory pressure is reached and then maintains that pressure for the set inspiratory time. The pressure is constant regardless of lung compliance or resistance. Tidal volume, however, will vary — if lungs become stiffer, less volume is delivered at the same pressure. This is the fundamental difference from VCV.

Question 113: Which of the following MOST accurately describes the hematocrit centrifuge's relative centrifugal force (RFC)?

150,000 RCF
3,000 RCF
15,000 RCF
10,000 RCF (Correct answer)

Correct answer: 10,000 RCF

Hematocrit centrifuges are designed to rapidly separate blood components, requiring a high relative centrifugal force (RCF) to efficiently pack red blood cells. An RCF of approximately 10,000-12,000 G (or RCF) is typically used for accurate hematocrit determination, making 10,000 RCF the most appropriate and common value among the choices for this application.

Question 114: Most modern patient monitors measure respiration rate using a technique called impedance pneumography. How is this measurement obtained?

A small, high-frequency current is passed between two ECG electrodes, and the change in thoracic impedance is measured. (Correct answer)
An SpO2 sensor detects small variations in the plethysmographic waveform.
A microphone on the patient's chest detects breathing sounds.
A thermistor near the nose and mouth measures airflow temperature changes.

Correct answer: A small, high-frequency current is passed between two ECG electrodes, and the change in thoracic impedance is measured.

Impedance pneumography utilizes two of the standard ECG electrodes. A safe, high-frequency, low-amplitude current is passed through the patient's thorax. As the patient inhales and exhales, the volume of air in the lungs changes, which causes a corresponding change in the electrical impedance of the chest cavity. The monitor detects these cyclical impedance changes and calculates the respiration rate from them.

Question 115: Under NFPA 99, which category of healthcare facility has the highest risk level requiring the most stringent electrical safety standards?

Category 1 (Correct answer)
Category 4
Category 3
Category 2

Correct answer: Category 1

NFPA 99 Category 1 applies to spaces where failure of equipment is likely to cause major injury or death to patients or caregivers, requiring the most stringent standards.

Question 116: What is the primary purpose of a heated wire ventilator circuit compared to a standard circuit?

To sterilize inspired gas before delivery to the patient
To prevent rainout (condensation) in the circuit tubing by keeping temperature above the dew point (Correct answer)
To reduce the internal diameter of the circuit to increase flow velocity
To measure inspiratory temperature for feedback control of FiO₂

Correct answer: To prevent rainout (condensation) in the circuit tubing by keeping temperature above the dew point

Humidified gas cools as it travels through circuit tubing, dropping below the dew point and condensing (rainout). Water pooling in the circuit can obstruct flow, alter delivered tidal volume, and harbor pathogens. Heated-wire circuits warm the tubing wall to prevent condensation. They do not sterilize gas, change FiO₂, or alter circuit diameter.

Question 117: What is an autoclave (steam sterilizer) and what parameters must be monitored?

A UV light sterilizer
A chemical soaking bath
A dry heat oven
A pressure vessel using saturated steam under pressure at specific temperature, pressure, and time, monitored by physical, chemical, and biological indicators (Correct answer)

Correct answer: A pressure vessel using saturated steam under pressure at specific temperature, pressure, and time, monitored by physical, chemical, and biological indicators

An autoclave uses saturated steam under pressure (132 degrees C at 30 psi for 4 minutes or 121 degrees C at 15 psi for 30 minutes).

Question 118: A surgeon reports that the electrosurgical unit (ESU) is not cutting effectively despite being set to the usual power level. The return electrode pad is properly applied. What should you check?

The operating table height
The anesthesia machine settings
The active electrode tip for damage, carbon buildup, or improper connection (Correct answer)
The room temperature setting

Correct answer: The active electrode tip for damage, carbon buildup, or improper connection

Reduced ESU cutting effectiveness typically indicates carbon buildup on the electrode tip, a damaged tip, or a poor connection.

Question 119: Which electrical safety test measures the current that could flow through a patient connected to a device?

Insulation resistance test
Patient leakage current test (Correct answer)
Line voltage measurement
Ground resistance test

Correct answer: Patient leakage current test

Patient leakage current testing measures stray current that could pass through a patient, per ANSI/AAMI ES60601-1 limits.

Question 120: What does the term 'interoperability' mean in the context of healthcare IT and medical devices?

The ability of different systems and devices to exchange and use information seamlessly (Correct answer)
The ability of a device to operate on battery power
The ability to operate in multiple countries
The speed at which a device processes data

Correct answer: The ability of different systems and devices to exchange and use information seamlessly

Interoperability refers to the ability of different healthcare systems and devices to communicate, exchange data, and use the information effectively.

Question 121: Which type of radiation is MOST effectively stopped by a thin sheet of aluminum foil?

X-rays
Gamma rays
Beta particles (Correct answer)
Alpha particles

Correct answer: Beta particles

Beta particles (electrons) have moderate penetration and are effectively shielded by a few millimeters of aluminum, unlike alpha (paper stops it) or gamma (requires dense shielding).

Question 122: Which document should a BMET consult first to determine PM intervals for a newly acquired ventilator?

The hospital's infection control policy
The previous facility's PM records
The manufacturer's service manual and recommended maintenance schedule (Correct answer)
OSHA 29 CFR 1910 general industry standards

Correct answer: The manufacturer's service manual and recommended maintenance schedule

Manufacturer service manuals contain device-specific PM intervals based on engineering design life and regulatory submissions, making them the primary reference.

Question 123: A spectrophotometer used for hemoglobin measurement is checked and found to have a wavelength accuracy error of ±5 nm at 415 nm. Why is this clinically significant?

Hemoglobin only absorbs in the infrared range, so UV errors compound
415 nm is the Soret band of hemoglobin, where absorbance changes sharply with wavelength, causing large measurement errors (Correct answer)
A 5 nm shift causes the blank reading to exceed the sample reading
415 nm is outside the visible spectrum and the detector sensitivity drops off

Correct answer: 415 nm is the Soret band of hemoglobin, where absorbance changes sharply with wavelength, causing large measurement errors

Hemoglobin's Soret absorption band at ~415 nm is extremely narrow and steep. Even a small wavelength shift (±5 nm) moves the measurement off the peak into a region of dramatically different absorbance, producing significant inaccuracy. This is why wavelength accuracy is a critical PM parameter for spectrophotometers used in clinical labs.

Question 124: What is bispectral index (BIS) monitoring and what does it measure?

A processed EEG parameter that quantifies anesthesia depth on a scale of 0 to 100 (Correct answer)
Binocular visual stimulus response
Blood flow velocity in cerebral arteries
Bilateral blood pressure comparison

Correct answer: A processed EEG parameter that quantifies anesthesia depth on a scale of 0 to 100

BIS analyzes brain electrical activity to provide a single number representing consciousness level for guiding anesthesia depth.

Question 125: A biomedical engineering department is developing an Alternative Equipment Maintenance (AEM) program. According to The Joint Commission, which of the following is a critical requirement for equipment included in an AEM program?

The manufacturer must provide written approval before a device can be placed on an AEM.
AEM programs can only be applied to non-medical, facility-related equipment.
All equipment on an AEM program must be less than two years old.
Scheduled maintenance completion for high-risk equipment in an AEM program must be 100%. (Correct answer)

Correct answer: Scheduled maintenance completion for high-risk equipment in an AEM program must be 100%.

The Joint Commission requires that scheduled maintenance for high-risk medical equipment, including life-support devices, must have a 100% completion rate, regardless of whether it is part of a standard or an Alternative Equipment Maintenance (AEM) program. This ensures that critical devices are properly maintained to prevent failure.

Question 126: During a laparoscopic procedure, what is the primary function of a surgical insufflator?

To provide high-intensity illumination via fiber optics
To capture and filter aerosolized surgical smoke
To distend the abdominal cavity with CO2 gas (Correct answer)
To irrigate and suction fluid from the surgical site

Correct answer: To distend the abdominal cavity with CO2 gas

The primary function of an insufflator is to deliver a controlled flow of carbon dioxide (CO2) gas to inflate, or distend, the abdominal cavity. This process, called pneumoperitoneum, lifts the abdominal wall away from the internal organs, creating a clear and stable working space for the surgeon to maneuver instruments.

Question 127: A hospital-grade receptacle differs from a standard commercial receptacle primarily by:

Green dot marking and reinforced contacts (Correct answer)
Higher voltage rating
Three-phase wiring capability
Built-in GFCI protection

Correct answer: Green dot marking and reinforced contacts

Hospital-grade receptacles are identified by a green dot and feature stronger contacts and construction to withstand repeated plug insertions.

Question 128: Which of the following features is exclusive to invasive blood pressure measurement as opposed to non-invasive?

Performance of the method can affect the results
Hypotensive blood pressure can be monitored (Correct answer)
It can provide continuous blood pressure measurements
A comparison between systolic and diastolic blood pressure can be made

Correct answer: Hypotensive blood pressure can be monitored

Invasive blood pressure measurement, typically via an arterial line, provides continuous, beat-to-beat blood pressure readings. This method is particularly vital for accurately monitoring patients with unstable hemodynamics, such as those experiencing severe hypotension, where non-invasive methods may be unreliable or insufficient. The continuous and precise data from invasive monitoring allows for immediate detection and management of critical blood pressure changes, which is a key advantage over non-invasive methods.

Question 129: A surgical headlight powered by a fiber optic light source produces uneven illumination with a dark center spot. The MOST probable cause is:

Insufficient lamp wattage
Incompatible light source coupling adapter
Broken fiber bundles at the center of the light guide cable (Correct answer)
Contaminated headlight lens

Correct answer: Broken fiber bundles at the center of the light guide cable

Broken optical fibers, especially centrally located ones, create dark spots in the illumination pattern because those fibers no longer transmit light.

Question 130: Which of the following current leakage tests does NOT meet IEC or NFPA 99 standards?

Chassis leakage current
Earth leakage current
Machine leakage current (Correct answer)
Patient leakage current

Correct answer: Machine leakage current

IEC 60601-1 and NFPA 99 standards specify several types of leakage current tests for medical electrical equipment, including Earth leakage current, Patient leakage current, and Chassis (or enclosure) leakage current. 'Machine leakage current' is not a recognized or standard term for leakage current testing within these international and national safety regulations.

Question 131: The primary purpose of a Faraday cage in a medical imaging suite is to:

Shield patients from ionizing radiation
Ground all electrical equipment simultaneously
Prevent external RF signals from interfering with MRI signals (Correct answer)
Reduce acoustic noise during MRI scanning

Correct answer: Prevent external RF signals from interfering with MRI signals

A Faraday cage blocks external radiofrequency signals that would interfere with the extremely weak MRI signals being detected.

Question 132: What requirements does CMS impose on hospitals regarding medical equipment management?

CMS has no equipment requirements
CMS only requires purchase records
CMS requires maintaining, testing, and inspecting all equipment per manufacturer recommendations as conditions for Medicare/Medicaid (Correct answer)
Requirements apply only to surgical equipment

Correct answer: CMS requires maintaining, testing, and inspecting all equipment per manufacturer recommendations as conditions for Medicare/Medicaid

CMS Conditions of Participation require comprehensive equipment management including inventory, maintenance, and testing.

Question 133: In which of the following scenarios is a device fault more likely to occur than a use mistake?

Noisy ECG readings near high-powered electrical equipment
Blurry ultrasound imagery from a newly inspected handheld ultrasound machine
A medication overdose due to a misconfigured infusion pump
A nurse station not receiving patient information from vital signs monitor (Correct answer)

Correct answer: A nurse station not receiving patient information from vital signs monitor

A nurse station not receiving patient information from a vital signs monitor strongly indicates a technical malfunction or device fault. This could be due to a communication error, network issue, or internal hardware problem with the monitor or the receiving system. The other scenarios are more likely attributable to user error or environmental factors rather than an inherent device fault.

Question 134: A neonatal ICU monitor alarm activates for a SpO2 reading of 80%. The BMET verifies equipment function is normal. What physiological artifact is LEAST likely responsible?

Peripheral vasoconstriction reducing perfusion
Probe placed on an edematous extremity
Motion artifact from infant movement
Elevated fetal hemoglobin concentration (Correct answer)

Correct answer: Elevated fetal hemoglobin concentration

Fetal hemoglobin (HbF) has similar optical absorption properties to adult hemoglobin at standard oximetry wavelengths and does not significantly cause inaccurate SpO2 readings.

Question 135: A technician is performing annual PM on a hospital bed. Which safety check is MOST critical for patient fall prevention?

Verifying the bed's Trendelenburg angle accuracy
Inspecting the mattress cover for tears
Calibrating the bed's weight scale
Testing siderail locking mechanisms for secure engagement (Correct answer)

Correct answer: Testing siderail locking mechanisms for secure engagement

Siderail locking mechanism failure is directly linked to patient falls, making it the highest-priority safety check during hospital bed PM.

Question 136: What is the purpose of risk-based preventive maintenance scheduling and how is equipment risk typically assessed?

Only manufacturer recommendations matter
All equipment gets the same schedule
Risk assessment only applies to new equipment
Risk assessment evaluates equipment function, physical risk, and maintenance requirements to prioritize PM resources (Correct answer)

Correct answer: Risk assessment evaluates equipment function, physical risk, and maintenance requirements to prioritize PM resources

Risk-based PM uses systematic assessment of function, physical risk, and maintenance requirements to prioritize resources.

Question 137: A CT scanner's X-ray tube requires replacement. Which parameter most directly indicates tube wear?

Display screen brightness
Patient table weight limit
Gantry rotation speed
Total accumulated milliampere-seconds (mAs) / heat units (Correct answer)

Correct answer: Total accumulated milliampere-seconds (mAs) / heat units

Accumulated heat units or mAs track the thermal stress on the anode; manufacturers define tube replacement thresholds based on this metric.

Question 138: Which network protocol is commonly used to monitor the status of network-connected medical devices?

SSH
SNMP (Correct answer)
FTP
SMTP

Correct answer: SNMP

SNMP is used to monitor and manage network devices by querying device status information and receiving alerts.

Question 139: A BMET is performing a PM on an infusion pump. Which test is most critical for patient safety?

Flow rate accuracy test (Correct answer)
Speaker volume check
Label legibility inspection
Keypad illumination check

Correct answer: Flow rate accuracy test

Flow rate accuracy directly affects drug dosing; an out-of-tolerance pump can deliver under- or over-doses with life-threatening consequences.

Question 140: Which of the following conventional ECG leads allows you to see the heart's inferior wall?

V1
I
aVF (Correct answer)
aVR

Correct answer: aVF

The inferior wall of the heart is best viewed by the ECG leads II, III, and aVF. These leads are positioned to detect electrical activity from the inferior aspect of the heart. Lead aVF specifically stands for 'augmented vector foot' and provides a clear electrical perspective looking up from the foot towards the heart's inferior surface.

Question 141: A BMET is tasked with troubleshooting an intermittent "No Signal" error on a single patient monitor connected to a large central monitoring network. The problem occurs randomly. Which of the following represents the MOST effective initial troubleshooting approach?

Re-terminate the network connections at the wall plate and the back of the monitor.
Immediately replace the patient monitor with a new one.
Systematically swap components one at a time with known good ones, starting with the easiest to replace. (Correct answer)
Request the hospital's IT department to reboot the central network switch for that floor.

Correct answer: Systematically swap components one at a time with known good ones, starting with the easiest to replace.

For intermittent problems, systematically swapping components is a highly effective troubleshooting technique. Starting with the simplest and most common failure points, such as the network patch cable, then the monitor itself, allows the technician to isolate the faulty element without making assumptions or performing unnecessarily disruptive actions like rebooting a network switch.

Question 142: What is the purpose of the smoke evacuator in a surgical laser procedure?

Remove laser plume containing viable cellular material and toxic byproducts (Correct answer)
Filter ambient OR air for sterility
Prevent laser beam scatter
Cool the laser handpiece during use

Correct answer: Remove laser plume containing viable cellular material and toxic byproducts

Laser plume can contain viable bacteria, viral particles, and toxic chemicals, making smoke evacuation an essential safety measure.

Question 143: In a clinical laboratory, a centrifuge is used to process a whole blood sample collected in a tube with an anticoagulant. The primary function of the centrifuge in this application is to:

Mix the blood with reagents for chemical analysis.
Separate components like plasma, platelets, and red cells based on density. (Correct answer)
Heat the sample to a specific temperature for incubation.
Measure the electrical conductivity of the blood cells.

Correct answer: Separate components like plasma, platelets, and red cells based on density.

A centrifuge spins samples at high speed, creating a strong centrifugal force. This force causes the denser components of the blood, like red blood cells, to move to the bottom of the tube, while less dense components, like plasma, remain at the top. This separation is essential for a wide variety of diagnostic tests.

Question 144: What is pulse transit time and how are newer patient monitors using it?

The time a pulse oximeter takes to display
The time for a pulse wave to travel between two arterial sites, being explored for continuous cuff-less blood pressure estimation (Correct answer)
The time between two heartbeats
The time between ECG spike and respiration

Correct answer: The time for a pulse wave to travel between two arterial sites, being explored for continuous cuff-less blood pressure estimation

PTT inversely correlates with blood pressure and enables continuous cuff-less BP estimation.

Question 145: How does a biphasic defibrillation waveform differ from a monophasic waveform, and why is it preferred?

Biphasic uses DC instead of AC
Biphasic uses higher energy levels
Biphasic charges faster
Biphasic delivers current in two directions, requiring less energy for effective defibrillation (Correct answer)

Correct answer: Biphasic delivers current in two directions, requiring less energy for effective defibrillation

Biphasic waveforms achieve higher first-shock success rates at lower energies (120-200J vs 360J monophasic), reducing myocardial damage.

Question 146: In electrosurgical units (ESU), the return electrode (dispersive pad) functions by:

Distributing current over a large surface area to minimize current density at the patient return site (Correct answer)
Increasing the frequency of current to improve cutting precision
Concentrating current to coagulate tissue at the return site
Grounding the patient to earth to prevent shock

Correct answer: Distributing current over a large surface area to minimize current density at the patient return site

The large area of the dispersive pad spreads current so densely is too low to heat tissue, preventing burns at the return site.

Question 147: A ventilator is a life-support device that assists with the primary physiological function of which organ system?

Respiratory system (Correct answer)
Digestive system
Urinary system
Endocrine system

Correct answer: Respiratory system

Ventilators are mechanical breathing devices that support the respiratory system. Their main function is to move breathable air into and out of the lungs, assisting patients who are physically unable to breathe or are breathing insufficiently.

Question 148: The term 'microshock' refers to hazardous current delivered:

Via a transcutaneous electrical nerve stimulator
Through intact skin at levels above 100 mA
Through a defibrillator paddle during cardioversion
Directly to the heart via an intracardiac catheter at levels as low as 10 µA (Correct answer)

Correct answer: Directly to the heart via an intracardiac catheter at levels as low as 10 µA

Microshock occurs when current bypasses skin resistance and reaches the heart directly, where as little as 10 µA can induce ventricular fibrillation.

Question 149: The glomerular filtration rate (GFR) is clinically important because it measures:

How effectively the kidneys filter blood plasma per unit time (Correct answer)
The reabsorption capacity of the proximal tubule
The rate at which the bladder empties urine
The concentration of creatinine excreted in urine

Correct answer: How effectively the kidneys filter blood plasma per unit time

GFR reflects the volume of plasma filtered by the glomeruli per minute and is the gold standard indicator of kidney function.

Question 150: After a power outage, several patient monitors fail to automatically reconnect to the central monitoring station. The network infrastructure has been verified as operational. What is the most likely issue?

The monitors lost their network configuration during the power interruption and need IP settings restored or DHCP leases renewed (Correct answer)
The monitors' display panels are damaged
The monitors need replacement
The central station software license expired

Correct answer: The monitors lost their network configuration during the power interruption and need IP settings restored or DHCP leases renewed

After a power outage, monitors may fail to reconnect due to DHCP lease expiration or boot sequence timing issues.

Question 151: Which sterilization method is MOST appropriate for heat-sensitive flexible endoscopes?

Ethylene oxide (EtO) gas sterilization (Correct answer)
Dry heat oven at 160°C
UV light irradiation
Steam autoclave at 134°C

Correct answer: Ethylene oxide (EtO) gas sterilization

Ethylene oxide gas sterilizes at low temperatures (37–63°C), making it suitable for heat-sensitive devices like flexible endoscopes that would be damaged by steam or dry heat.

Question 152: Which of the following best describes the function of an optocoupler (optoisolator) in medical equipment?

Measuring light intensity for phototherapy
Converting optical signals to radio frequency
Transmitting signals between circuits while maintaining electrical isolation (Correct answer)
Amplifying weak biological signals

Correct answer: Transmitting signals between circuits while maintaining electrical isolation

An optocoupler uses an LED and photodetector to transmit signals between electrically isolated circuits, maintaining patient safety.

Question 153: What type of radiation does a conventional X-ray machine produce?

Ultrasonic sound waves
Gamma radiation from isotopes
Non-ionizing infrared radiation
Ionizing electromagnetic radiation (X-rays) (Correct answer)

Correct answer: Ionizing electromagnetic radiation (X-rays)

X-ray tubes produce ionizing electromagnetic radiation by accelerating electrons into a tungsten anode, emitting photons in the X-ray spectrum.

Question 154: Which of the following is a manual blood pressure auscultation device?

Pressure transducer
Cannula
Manometer (Correct answer)
Korotkoff sounds

Correct answer: Manometer

A manometer is a key component of a manual blood pressure auscultation device, specifically a sphygmomanometer. It is the gauge that measures the pressure within the inflatable cuff, allowing the healthcare professional to read the systolic and diastolic blood pressure values. While Korotkoff sounds are listened for, the manometer provides the actual pressure measurement.

Question 155: What is the minimum recommended testing frequency for electrical safety inspections of patient care equipment according to NFPA 99?

Every 2 years
Every 6 months
Annually (Correct answer)
Monthly

Correct answer: Annually

NFPA 99 recommends electrical safety testing at least annually, though more frequent testing may be required based on risk assessment.

Question 156: The output impedance of a device should ideally be low because:

It minimizes signal voltage drop when driving a load (Correct answer)
It increases the device's power consumption
It prevents electromagnetic interference
It increases current draw from the power supply

Correct answer: It minimizes signal voltage drop when driving a load

Low output impedance ensures minimal voltage drop across the source impedance when current flows, maintaining signal integrity to the load.

Question 157: What component in an electrical circuit allows current to flow in only one direction?

Resistor
Inductor
Capacitor
Diode (Correct answer)

Correct answer: Diode

A diode is a semiconductor device that allows current to flow in one direction (forward bias) while blocking current in the reverse direction.

Question 158: What does the term 'spatial resolution' describe in diagnostic imaging?

The ability to distinguish two closely spaced objects as separate (Correct answer)
The speed of image acquisition
The size of the patient bore
The range of detectable tissue densities

Correct answer: The ability to distinguish two closely spaced objects as separate

Spatial resolution quantifies how small a detail the imaging system can distinguish, typically measured in line pairs per millimeter (lp/mm).

Question 159: A blood gas analyzer is producing results that fail quality control. The QC material is within its expiration date and has been stored properly. What systematic troubleshooting approach should be taken?

Replace the entire analyzer
Try a new QC lot, recalibrate the analyzer, check reagents and electrode condition, and contact manufacturer support if needed (Correct answer)
Run patient samples anyway and note the QC failure
Turn the analyzer off and back on

Correct answer: Try a new QC lot, recalibrate the analyzer, check reagents and electrode condition, and contact manufacturer support if needed

Systematic troubleshooting involves trying a new QC lot, performing calibration, checking reagents, and inspecting electrode condition.

Question 160: What does OSHA require regarding bloodborne pathogen exposure protection for biomedical technicians?

Employers must provide an exposure control plan, training, PPE, hepatitis B vaccination, and post-exposure procedures (Correct answer)
No specific requirements exist
Technicians must purchase own PPE
Only hand washing is required

Correct answer: Employers must provide an exposure control plan, training, PPE, hepatitis B vaccination, and post-exposure procedures

OSHA's Bloodborne Pathogens Standard requires comprehensive employer-provided protection for workers with occupational exposure.

Question 161: During a PM on a defibrillator, the BMET checks delivered energy. What instrument is used to measure this?

Oscilloscope only
Multimeter
ECG simulator
Defibrillator analyzer (Correct answer)

Correct answer: Defibrillator analyzer

A defibrillator analyzer measures delivered energy in joules, charge time, and waveform characteristics during PM testing.

Question 162: What does HIPAA require regarding the transmission of electronic Protected Health Information (ePHI) over a network?

ePHI must be stored on local drives only
ePHI can be sent in plaintext if the network is internal
ePHI must be encrypted during transmission using appropriate safeguards (Correct answer)
ePHI must only be sent via fax

Correct answer: ePHI must be encrypted during transmission using appropriate safeguards

HIPAA's Security Rule requires that ePHI transmitted over networks be protected through encryption and other technical safeguards.

Question 163: A DICOM workstation cannot retrieve images from the PACS server. After confirming network connectivity, the BMET should verify:

Hard disk RAID redundancy status
AE Title, IP address, and port configuration for both nodes (Correct answer)
JPEG compression level settings
Monitor calibration with a photometer

Correct answer: AE Title, IP address, and port configuration for both nodes

DICOM communication requires matching Application Entity (AE) Titles, correct IP addresses, and open TCP ports between devices.

Question 164: Which type of fire extinguisher is appropriate for electrical equipment fires in a biomedical equipment area?

Class C (CO2 or dry chemical) (Correct answer)
Class D (dry powder)
Class A (water)
Class B (foam)

Correct answer: Class C (CO2 or dry chemical)

Class C extinguishers use non-conductive agents like CO2 or dry chemical, making them safe for energized electrical equipment fires.

Question 165: Which cranial nerve is primarily responsible for carrying parasympathetic fibers to the heart and abdominal organs?

Vagus nerve (CN X) (Correct answer)
Trigeminal nerve (CN V)
Hypoglossal nerve (CN XII)
Glossopharyngeal nerve (CN IX)

Correct answer: Vagus nerve (CN X)

The vagus nerve (CN X) provides the major parasympathetic innervation to the heart, lungs, and most abdominal organs.

Question 166: What is the purpose of a sequential compression device (SCD) and what does a biomedical technician verify?

Applies intermittent pneumatic compression to legs to prevent deep vein thrombosis (Correct answer)
Compresses surgical instruments
Provides chest compressions during CPR
Compresses IV fluid bags

Correct answer: Applies intermittent pneumatic compression to legs to prevent deep vein thrombosis

SCDs apply sequential pneumatic pressure to leg sleeves to promote venous blood return and prevent DVT.

CBET (Certified Biomedical Equipment Technician) Exam

The CBET (Certified Biomedical Equipment Technician) Exam exam validates essential knowledge and skills required for certification or licensure in this field.

165

Questions

210 min

Time Limit

68%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds

These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

aami.org — Eligibility, exam format, time limit, test delivery, fees, passing score, renewal, retake fee, retake policy, score validity · verified Nov 2026