CABT Certified Associate in Biomedical Technology Exam — Questions and Answers

Question 1: A biomedical technician is servicing a diagnostic imaging system and finds a spreadsheet on the desktop containing a list of patient names and their medical record numbers. According to the Health Insurance Portability and Accountability Act (HIPAA), what is the most appropriate immediate action?

Make a copy of the file onto an encrypted drive as evidence of the breach.
Delete the file immediately to prevent unauthorized access by others.
Ignore the file, as the technician is not a clinical user of the system.
Report the finding to their immediate supervisor and the facility's designated Privacy Officer. (Correct answer)

Correct answer: Report the finding to their immediate supervisor and the facility's designated Privacy Officer.

The discovery of unsecured Protected Health Information (PHI) is a potential data breach under HIPAA. The technician's duty is not to independently decide how to handle the data (e.g., deleting or copying it) but to follow organizational policy by reporting the incident through the proper channels, which always includes their supervisor and the HIPAA Privacy/Security Officer.

Question 2: Overdamping of an invasive arterial pressure waveform will result in:

Accurate mean arterial pressure only if correctly zeroed
Overestimation of systolic pressure and underestimation of diastolic pressure
Underestimation of systolic pressure and overestimation of diastolic pressure (Correct answer)
No effect on numeric values

Correct answer: Underestimation of systolic pressure and overestimation of diastolic pressure

An overdamped waveform smooths out pressure oscillations, reducing the measured systolic peak and raising the apparent diastolic value, while mean pressure remains relatively accurate.

Question 3: Which cellular organelle is the primary site of ATP production through oxidative phosphorylation?

Mitochondria (Correct answer)
Golgi apparatus
Lysosome
Endoplasmic reticulum

Correct answer: Mitochondria

Mitochondria contain the electron transport chain and ATP synthase complexes responsible for producing the majority of cellular ATP.

Question 4: A technician is working on a portable insulin pump. The compact size and low power consumption of the device's control circuitry are critical design features. These are made possible primarily by the use of which technology?

Vacuum tubes
High-capacity resistors
Electromechanical relays
Integrated circuits (Semiconductors) (Correct answer)

Correct answer: Integrated circuits (Semiconductors)

Integrated circuits (ICs), built from semiconductor materials, are the foundation of modern electronics, enabling the miniaturization and power efficiency required for portable and implantable medical devices like insulin pumps and pacemakers. They allow for complex circuits with millions or billions of transistors, amplifiers, and other components to be placed on a single tiny chip.

Question 5: When testing ground wire integrity on patient care equipment, the AAMI ES1 standard specifies a maximum resistance of:

1.0 ohm
0.01 ohm
0.1 ohm (Correct answer)
0.5 ohm

Correct answer: 0.1 ohm

AAMI ES1 requires that the resistance from the grounding pin to any exposed conductive patient-contact surface not exceed 0.1 ohm to ensure effective fault current dissipation.

Question 6: A central venous pressure (CVP) waveform shows an elevated 'a' wave. This finding is most associated with:

Tricuspid stenosis or right ventricular non-compliance (Correct answer)
Tricuspid regurgitation
Pulmonary hypertension
Mitral stenosis

Correct answer: Tricuspid stenosis or right ventricular non-compliance

An elevated 'a' wave in the CVP tracing reflects increased atrial contraction force against a non-compliant or obstructed right ventricle, as seen in tricuspid stenosis.

Question 7: During installation, the biomedical technician should ensure that an electrically powered medical device is connected to:

Any available standard outlet in the room
A hospital-grade grounded outlet meeting applicable standards (Correct answer)
A GFCI outlet if available
An ungrounded outlet to prevent ground loops

Correct answer: A hospital-grade grounded outlet meeting applicable standards

Medical devices must be connected to hospital-grade grounded outlets that meet NFPA 99 and UL standards to ensure patient and staff safety.

Question 8: A biomedical technician performs an electrical safety test and measures chassis leakage current of 600 µA on a Class I device. What action should be taken?

Escalate to manufacturer for optional firmware update
Recalibrate the leakage current tester and retest
Remove the device from service; it exceeds the 500 µA limit for Class I devices (Correct answer)
Place the device back in service; it is within normal limits

Correct answer: Remove the device from service; it exceeds the 500 µA limit for Class I devices

AAMI/IEC standards for Class I medical devices set a maximum chassis leakage current of 500 µA under normal conditions; 600 µA exceeds this limit and requires the device be removed from service.

Question 9: What is the purpose of a pulse oximeter?

Analyze enzymes
Check blood oxygen level (Correct answer)
Check glucose
Measure temperature

Correct answer: Check blood oxygen level

A pulse oximeter is a non-invasive medical device used to measure a patient's oxygen saturation level in the blood (SpO2) and their pulse rate. It works by emitting light through a finger or earlobe and detecting the amount of light absorbed by oxygenated and deoxygenated hemoglobin. This quick and easy measurement provides crucial information about a patient's respiratory and circulatory status.

Question 10: Which FDA classification requires the most stringent premarket approval process for medical devices?

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

Correct answer: Class III

Class III devices require Premarket Approval (PMA) because they sustain or support life or present a potential unreasonable risk of illness or injury.

Question 11: A transcutaneous electrical nerve stimulator (TENS) unit is contraindicated for placement over which area?

Lower back for chronic pain
Knee joint for arthritis
Carotid sinus area of the neck (Correct answer)
Shoulder for rotator cuff pain

Correct answer: Carotid sinus area of the neck

TENS electrode placement over the carotid sinus can trigger vagal reflexes, causing bradycardia or hypotension and is therefore strictly contraindicated.

Question 12: In the structural hierarchy of the human body, which level of organization is considered more complex than tissues?

Molecules
Cells
Organs (Correct answer)
Organ systems

Correct answer: Organs

The levels of structural organization in the body, from simplest to most complex, are: chemical (atoms/molecules), cellular, tissue, organ, organ system, and organism. Tissues are groups of similar cells that work together, and organs (like the heart or lungs) are composed of different types of tissues working together for a common function.

Question 13: When a biomedical engineer reviews a ventilator parameter labeled 'FRC,' what physiological measurement does this represent?

The maximum volume of air exhaled after maximum inhalation
The volume of air remaining in the lungs after a normal passive exhalation (Correct answer)
The volume of air inspired in one normal breath
The maximum volume of air that can be inspired after a normal inhalation

Correct answer: The volume of air remaining in the lungs after a normal passive exhalation

Functional Residual Capacity (FRC) is the volume of gas remaining in the lungs after a normal passive expiration, combining expiratory reserve volume and residual volume.

Question 14: What is the primary safety function of an isolation transformer in the power supply of medical equipment used in an operating room?

To convert the incoming AC power to DC power.
To act as the primary circuit breaker for the device.
To create an ungrounded secondary circuit, reducing macroshock risk. (Correct answer)
To increase the line voltage for high-power devices.

Correct answer: To create an ungrounded secondary circuit, reducing macroshock risk.

An isolation transformer's primary purpose in medical systems is safety. It creates a secondary power source that is electrically isolated from the grounded primary. This means that a person touching one live conductor and ground will not complete a circuit, drastically reducing the risk of a dangerous macroshock, which is especially important in critical care areas like operating rooms.

Question 15: Which of the following best describes the purpose of a 'load test' on an uninterruptible power supply (UPS)?

Checks the battery charger input current
Verifies input voltage regulation under steady-state conditions
Tests the surge suppression circuitry
Confirms the UPS can deliver rated output power for a specified duration (Correct answer)

Correct answer: Confirms the UPS can deliver rated output power for a specified duration

A load test applies rated or specified load to the UPS to verify it sustains output power for the required backup duration.

Question 16: Which assessment method provides the MOST reliable data for CABT professionals making critical decisions?

Informal verbal feedback alone
Standardized tools combined with professional observation (Correct answer)
Social media reviews and testimonials
Single-source data from one stakeholder

Correct answer: Standardized tools combined with professional observation

Combining standardized assessment tools with professional observation provides the most reliable and comprehensive data. Standardized tools ensure consistency and validity, while professional observation captures nuances that tools might miss.

Question 17: What is the most important professional competency for CABT certification in laboratory equipment?

Ability to work alone exclusively
Speed of task completion
Deep knowledge combined with practical application skills (Correct answer)
Memorization of all reference materials

Correct answer: Deep knowledge combined with practical application skills

Professional competency requires both deep knowledge of the subject matter and the ability to apply that knowledge in practical situations.

Question 18: What is the function of the kidneys?

Filter blood (Correct answer)
Control breathing
Pump blood
Digest food

Correct answer: Filter blood

The kidneys are vital organs that primarily function to filter waste products and excess water from the blood to produce urine. They also play crucial roles in regulating blood pressure, electrolyte balance, and red blood cell production. This filtration process is essential for maintaining the body's internal chemical balance.

Question 19: Which safety standard governs the maximum allowable leakage current for patient-applied monitoring equipment in the US?

NFPA 70 (NEC)
IEC 61000
ANSI/AAMI ES60601-1 (Correct answer)
UL 508A

Correct answer: ANSI/AAMI ES60601-1

ANSI/AAMI ES60601-1 (based on IEC 60601-1) sets the safety requirements including leakage current limits for medical electrical equipment applied to patients.

Question 20: Which prefix means 'within' or 'inside'?

Ecto-
Peri-
Exo-
Endo- (Correct answer)

Correct answer: Endo-

'Endo-' means within or inside, as in endoscopy (viewing inside the body).

Question 21: In a patient care environment, 'equipotential grounding' primarily protects against:

Radio-frequency interference
Electrostatic discharge from staff clothing
Microshock from potential differences between grounded surfaces (Correct answer)
Voltage surges from lightning

Correct answer: Microshock from potential differences between grounded surfaces

Equipotential grounding ensures all conductive surfaces in a patient care area are at the same potential, preventing microshock from small current flow through the patient.

Question 22: A clinical thermometer used in a specimen incubator reads 2°C above the expected set point after calibration. The technician should:

Adjust the incubator set point to compensate and document the offset (Correct answer)
Apply a correction factor of -2°C to all readings
Replace the thermometer immediately
Continue using the incubator without changes

Correct answer: Adjust the incubator set point to compensate and document the offset

Adjusting the set point to compensate and documenting the calibration offset is the appropriate corrective action when a calibrated thermometer reveals a systematic error.

Question 23: What does an ECG machine measure?

Lung function
Body temperature
Blood sugar
Heart electrical activity (Correct answer)

Correct answer: Heart electrical activity

An Electrocardiogram (ECG or EKG) machine measures and records the electrical activity of the heart. It detects the tiny electrical changes on the skin that arise from the heart muscle's electrophysiological pattern during each heartbeat. This information is crucial for diagnosing various heart conditions, including arrhythmias, heart attacks, and other cardiac abnormalities.

Question 24: Which type of pipette should be used to transfer 0.05 mL of serum for a clinical chemistry assay?

Transfer pipette (Pasteur)
10 mL serological pipette
50 µL micropipette (Correct answer)
25 mL volumetric pipette

Correct answer: 50 µL micropipette

A 50 µL (0.05 mL) micropipette with a calibrated disposable tip provides the accuracy required for small-volume serum transfers in clinical chemistry.

Question 25: In an automated external defibrillator (AED), what does the device analyze before advising a shock?

Heart rhythm via ECG electrodes (Correct answer)
Blood pressure waveform
Oxygen saturation level
Respiratory rate

Correct answer: Heart rhythm via ECG electrodes

AEDs use built-in algorithms to analyze the patient's ECG rhythm through electrode pads to determine whether a shockable rhythm such as VF or pulseless VT is present.

Question 26: A technician is troubleshooting a patient monitoring system where a very weak physiological signal (like an ECG) is not being displayed correctly. The issue is likely in the amplification stage. Which component is specifically designed to amplify such weak signals with high precision in medical instruments?

A transformer
An operational amplifier (Op-Amp) (Correct answer)
A relay
A fuse

Correct answer: An operational amplifier (Op-Amp)

Operational amplifiers (Op-Amps) are essential components in medical instrumentation for amplifying weak biological signals, such as those from an ECG or EEG. They provide the high gain, high input impedance, and low output impedance necessary to accurately boost these signals for processing and display without significant distortion or loss.

Question 27: A patient with a pacemaker is referred for imaging. Which modality poses the greatest safety risk?

Conventional X-ray
Nuclear medicine bone scan
MRI (Correct answer)
CT with contrast

Correct answer: MRI

The strong static and time-varying magnetic fields in MRI can cause pacemaker malfunction, lead displacement, or device heating, making it the highest-risk modality for most pacemaker patients.

Question 28: What is the primary purpose of a grid in diagnostic radiography?

To reduce scattered radiation reaching the detector (Correct answer)
To collimate the primary beam
To increase patient dose
To filter low-energy photons from the tube

Correct answer: To reduce scattered radiation reaching the detector

A radiographic grid is placed between the patient and detector to absorb scattered radiation, improving image contrast.

Question 29: A 12-bit ADC with a 5V reference voltage has a resolution of approximately:

122 mV
12.2 mV
1.22 mV (Correct answer)
0.122 mV

Correct answer: 1.22 mV

Resolution = Vref / 2^n = 5V / 4096 ≈ 1.22 mV per step for a 12-bit ADC.

Question 30: An IFU (Instructions for Use) for a medical device must be provided in which language for devices sold in the United States?

English and Spanish
English and any language spoken by more than 5% of the local population
English only (Correct answer)
English, with translations required if the device is sold in multilingual markets

Correct answer: English only

FDA requires that IFUs for devices marketed in the US be in English, though manufacturers may include additional languages.

Question 31: Which layer of the heart wall is responsible for the contractile function of the heart?

Endocardium
Epicardium
Myocardium (Correct answer)
Pericardium

Correct answer: Myocardium

The myocardium is the thick muscular middle layer of the heart wall that performs contraction to pump blood.

Question 32: An op-amp in an inverting configuration has Rf = 100 kΩ and Rin = 10 kΩ. What is the voltage gain?

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

Correct answer: -10

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

Question 33: What is the primary function of the nephron in the kidney?

Hormone secretion
Blood filtration and urine formation (Correct answer)
Immune surveillance
Red blood cell production

Correct answer: Blood filtration and urine formation

The nephron is the functional unit of the kidney, filtering blood and forming urine through filtration, reabsorption, and secretion.

Question 34: Which water type is recommended for use in steam sterilizers to prevent mineral scaling and equipment damage?

Filtered but not deionized water
Distilled or deionized water (Correct answer)
Softened water treated with sodium chloride
Standard municipal tap water

Correct answer: Distilled or deionized water

Distilled or deionized water is recommended because it lacks minerals found in tap water that cause scaling deposits in sterilizer chambers and on instrument surfaces.

Question 35: Which type of amplifier configuration provides both voltage gain and current gain but with a 180° phase shift?

Common gate
Common base
Common collector
Common emitter (Correct answer)

Correct answer: Common emitter

The common emitter configuration inverts the output signal (180° phase shift) and provides both voltage and current gain.

Question 36: Intracranial pressure (ICP) monitoring via an intraventricular catheter (EVD) is zeroed to the level of the:

Vertex of the skull
Foramen of Monro (external auditory meatus as surface landmark) (Correct answer)
Phlebostatic axis
Lumbar cistern

Correct answer: Foramen of Monro (external auditory meatus as surface landmark)

ICP is referenced to the level of the foramen of Monro, which is approximated at the bedside by the external auditory meatus (ear canal).

Question 37: What is the role of the sinoatrial (SA) node in cardiac physiology?

It controls valve opening and closing
It initiates the electrical impulse that sets the heart rate (Correct answer)
It delays conduction between atria and ventricles
It supplies blood to the conduction system

Correct answer: It initiates the electrical impulse that sets the heart rate

The SA node, located in the right atrium, spontaneously depolarizes at 60–100 bpm, acting as the natural pacemaker of the heart.

Question 38: Which MRI sequence is most sensitive for detecting acute cerebral ischemia within the first few hours?

T1-weighted imaging
FLAIR
T2-weighted imaging
Diffusion-weighted imaging (DWI) (Correct answer)

Correct answer: Diffusion-weighted imaging (DWI)

DWI detects restricted diffusion of water molecules in acutely infarcted tissue, making it the most sensitive sequence for hyperacute stroke within hours of onset.

Question 39: What is the first step in troubleshooting a non-functional medical device?

Call the manufacturer
Replace the battery
Disassemble the unit
Check power and connections (Correct answer)

Correct answer: Check power and connections

When troubleshooting a non-functional medical device, the first and most fundamental step is to check its power source and all connections. Many device malfunctions stem from simple issues like being unplugged, a tripped circuit breaker, a dead battery, or loose cables. Verifying these basic elements can quickly resolve common problems before moving on to more complex diagnostic steps.

Question 40: Which maintenance schedule item is considered a 'time-based' preventive maintenance task?

Replacing an infusion pump battery every 2 years regardless of cycles (Correct answer)
Cleaning a device only when visibly soiled
Calibrating a device after each repair
Replacing a filter only when flow is reduced

Correct answer: Replacing an infusion pump battery every 2 years regardless of cycles

Time-based preventive maintenance replaces components on a fixed calendar interval regardless of use or condition, such as replacing a battery every two years.

Question 41: Which type of epithelium lines the urinary bladder and is capable of stretching?

Transitional epithelium (urothelium) (Correct answer)
Stratified squamous epithelium
Pseudostratified columnar epithelium
Simple squamous epithelium

Correct answer: Transitional epithelium (urothelium)

Transitional epithelium (urothelium) lines the urinary bladder and ureters, uniquely able to stretch as the bladder fills.

Question 42: What phenomenon occurs when an AC signal causes a transistor to conduct during only part of the input cycle in Class B amplification?

Crossover distortion (Correct answer)
Phase distortion
Intermodulation distortion
Harmonic distortion

Correct answer: Crossover distortion

Crossover distortion occurs at the zero-crossing point in Class B push-pull amplifiers due to the transistor's 0.6V threshold voltage.

Question 43: The spatial resolution of a digital radiographic system is most directly limited by which factor?

Detector pixel pitch (Correct answer)
X-ray tube focal spot size only
kVp setting
Source-to-image distance

Correct answer: Detector pixel pitch

In digital radiography, the pixel pitch (size of individual detector elements) sets the fundamental limit on spatial resolution through the Nyquist sampling theorem.

Question 44: Which safety practice is required when transporting a compressed gas cylinder in a hospital laboratory?

Secure it upright in a wheeled cart with a chain or strap (Correct answer)
Remove the regulator before transport
Carry it horizontally by one person
Transport it only in freight elevators with no personnel

Correct answer: Secure it upright in a wheeled cart with a chain or strap

Compressed gas cylinders must be secured upright in a wheeled cart with a restraining chain or strap to prevent tipping and valve damage during transport.

Question 45: Which type of power outlet is required by NFPA 99 to be supplied by the emergency essential electrical system in an operating room?

Standard 120 V duplex only
Any NEMA 5-15R receptacle with a twist-lock adapter
Red-colored receptacles connected to the critical branch (Correct answer)
Blue GFCI receptacles

Correct answer: Red-colored receptacles connected to the critical branch

Red receptacles in ORs are connected to the critical branch of the essential electrical system, ensuring power during a utility failure.

Question 46: During preventive maintenance on a hospital bed, which electrical safety test measures the current that could flow through a patient touching the bed frame and a grounded surface?

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

Correct answer: Chassis leakage current test

Chassis leakage current testing measures current flowing from the equipment chassis to ground, simulating the shock hazard a patient could experience.

Question 47: In a physiologic monitoring system, what is a 'zeroing' procedure used for?

Calibrating the oxygen sensor to room air
Resetting the alarm limits to factory defaults
Clearing all stored waveform data from memory
Establishing the atmospheric pressure as the baseline reference for invasive pressure measurements (Correct answer)

Correct answer: Establishing the atmospheric pressure as the baseline reference for invasive pressure measurements

Zeroing an invasive pressure transducer exposes it to atmospheric pressure and sets that as the zero reference point, ensuring all subsequent pressure measurements are accurate relative to atmosphere.

Question 48: Glutaraldehyde (2%) used as a high-level disinfectant requires a minimum immersion contact time of approximately:

5 minutes at room temperature
20–45 minutes for high-level disinfection (Correct answer)
3 hours for complete inactivation of all pathogens
10 hours to achieve full sterilization of immersed instruments

Correct answer: 20–45 minutes for high-level disinfection

2% glutaraldehyde requires approximately 20–45 minutes of immersion contact time to achieve high-level disinfection and inactivate all non-spore microorganisms.

Question 49: Which semiconductor device is most suitable for controlling large currents in medical power supplies using a low-power control signal?

Bipolar junction transistor
Zener diode
Junction diode
MOSFET (Correct answer)

Correct answer: MOSFET

MOSFETs are voltage-controlled devices with very high input impedance, capable of switching large currents with minimal gate drive power, making them ideal for power supply control.

Question 50: What does the prefix 'brady-' mean in medical terminology?

Slow (Correct answer)
Fast
Low
High

Correct answer: Slow

The prefix 'brady-' in medical terminology means slow. It is commonly used in terms like 'bradycardia' (slow heart rate) or 'bradypnea' (slow breathing). Understanding such prefixes is fundamental for interpreting medical terms.

Question 51: In a biomedical pressure transducer using a strain gauge, what electrical parameter changes in response to physical deformation?

Capacitance
Voltage
Resistance (Correct answer)
Inductance

Correct answer: Resistance

Strain gauges work on the piezoresistive principle — mechanical deformation changes the geometry of the conductor, altering its electrical resistance.

Question 52: A CBET is asked to evaluate a newly proposed telemedicine cart that includes a tablet, camera, and vital signs monitor. The MOST appropriate regulatory framework to apply is:

HIPAA Security Rule only, since only data is transmitted
Only state telemedicine licensure laws
FDA regulations for the vital signs monitor component plus HIPAA for data security (Correct answer)
FCC regulations for wireless transmission exclusively

Correct answer: FDA regulations for the vital signs monitor component plus HIPAA for data security

The vital signs monitor is an FDA-regulated medical device, while HIPAA governs the security of any transmitted patient health information, making both frameworks applicable.

Question 53: When calibrating an invasive blood pressure transducer, zeroing the transducer at the level of the phlebostatic axis compensates for:

Electrical offset in the Wheatstone bridge
Damping coefficient variation
Catheter tip resonance artifact
Hydrostatic pressure error due to fluid column height (Correct answer)

Correct answer: Hydrostatic pressure error due to fluid column height

Zeroing at the phlebostatic axis eliminates hydrostatic pressure added by or subtracted from the fluid column between the transducer and the patient's heart.

Question 54: A biomedical technician discovers that the ground pin of a 3-prong medical device plug is broken. The safest immediate action is to:

Continue use if the device passes a visual inspection
Replace the fuse and return to service
Use a 2-to-3 prong adapter until parts arrive
Tag out the device and remove it from service (Correct answer)

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

A broken ground pin eliminates the primary fault-current path, creating a shock hazard; the device must be removed from service immediately.

Question 55: Which gas is used as the primary pneumatic drive gas in most hospital ventilators and why?

Nitrogen, because it is inert and low-cost
Helium, because of its low density and reduced work of breathing
Air or oxygen at 50 psi, because it provides consistent driving pressure for bellows or pistons (Correct answer)
Oxygen, because it enriches the delivered FiO2

Correct answer: Air or oxygen at 50 psi, because it provides consistent driving pressure for bellows or pistons

Hospital ventilators use 50 psi compressed air or oxygen as a pneumatic drive source because this pressure reliably actuates pneumatic valves and drives bellows or pistons.

Question 56: In a patient with a fractured femur, which artery is at greatest risk of injury due to its proximity to the bone in the femoral shaft?

Femoral artery
Perforating branches of the deep femoral artery (Correct answer)
Popliteal artery
Tibial artery

Correct answer: Perforating branches of the deep femoral artery

Perforating branches of the profunda femoris (deep femoral artery) run close to the femoral shaft and are commonly injured in mid-shaft femur fractures.

Question 57: A Doppler ultrasound flow detector operates on the principle that:

Moving red blood cells shift the frequency of reflected ultrasound proportional to their velocity (Correct answer)
Sound reflects off stationary tissue at a fixed frequency
Electrical impedance changes as blood flows through a vessel
Pressure differentials across a stenosis generate a characteristic waveform

Correct answer: Moving red blood cells shift the frequency of reflected ultrasound proportional to their velocity

The Doppler effect causes the frequency of ultrasound reflected from moving erythrocytes to shift up or down relative to flow direction, allowing velocity calculation.

Question 58: Which type of muscle tissue is involuntary, striated, and found only in the heart?

Skeletal muscle
Smooth muscle
Cardiac muscle (Correct answer)
Visceral muscle

Correct answer: Cardiac muscle

Cardiac muscle is uniquely involuntary and striated, with intercalated discs that allow electrical coupling between cells for coordinated contraction.

Question 59: What type of feedback is used in most biomedical amplifier designs to stabilize gain and improve linearity?

Regenerative feedback
No feedback
Positive feedback
Negative feedback (Correct answer)

Correct answer: Negative feedback

Negative feedback reduces gain but improves stability, linearity, bandwidth, and reduces distortion — essential characteristics for accurate biomedical signal amplification.

Question 60: When troubleshooting an IV infusion pump that is alarming 'air-in-line' continuously with a bubble-free line, the technician should:

Increase the alarm sensitivity threshold
Fill the IV bag completely to eliminate any air space
Replace the IV tubing with a smaller bore set
Inspect and clean the air-detection ultrasonic sensor window (Correct answer)

Correct answer: Inspect and clean the air-detection ultrasonic sensor window

False air-in-line alarms are frequently caused by protein or fluid residue on the ultrasonic sensor window, which simulates an air bubble.

Question 61: Which factor MOST significantly affects the quality of technical outcomes in CABT practice?

The time of day the procedure is performed
The brand of equipment being used
The speed at which procedures are completed
The practitioner's training, preparation, and attention to detail (Correct answer)

Correct answer: The practitioner's training, preparation, and attention to detail

The quality of technical outcomes depends primarily on the practitioner's level of training, thorough preparation, and careful attention to detail. While equipment matters, the professional's competence is the most significant factor.

Question 62: The concept of homeostasis is fundamental to physiology. Which of the following scenarios best illustrates this principle?

The transmission of a nerve impulse from a sensory neuron to the brain.
The process of breaking down food into nutrients in the digestive system.
The increase in heart rate and respiration during physical exercise.
The shivering of muscles in a cold environment to generate heat and maintain body temperature. (Correct answer)

Correct answer: The shivering of muscles in a cold environment to generate heat and maintain body temperature.

Homeostasis is the body's ability to maintain a stable internal environment despite external changes. Shivering is a physiological response to cold, where involuntary muscle contractions generate heat to counteract a drop in body temperature, thus maintaining internal stability.

Question 63: Which waveform component of an arterial blood pressure tracing represents the dicrotic notch?

Peak systolic pressure
End-diastolic pressure
Closure of the aortic valve (Correct answer)
Opening of the mitral valve

Correct answer: Closure of the aortic valve

The dicrotic notch on the arterial waveform corresponds to the closure of the aortic valve at the end of systole.

Question 64: Which of the following correctly describes the primary physiological function of the alveoli in the respiratory system?

To warm and humidify incoming air before it reaches the lungs
To produce mucus that traps foreign particles
To facilitate the exchange of oxygen and carbon dioxide between the air and the blood (Correct answer)
To contract and expand, forcing air in and out of the lungs

Correct answer: To facilitate the exchange of oxygen and carbon dioxide between the air and the blood

The alveoli are tiny, thin-walled air sacs in the lungs where the crucial process of gas exchange occurs. Oxygen from inhaled air diffuses across the alveolar and capillary walls into the bloodstream, while carbon dioxide diffuses from the blood into the alveoli to be exhaled.

Question 65: A biomedical technician installs a new infusion pump and notices the alarm system does not respond during self-test. What is the most appropriate next action?

Disable the alarm and document the issue
Replace the battery and retest
Label the device as out-of-service and notify clinical staff (Correct answer)
Place the device in service and monitor it closely

Correct answer: Label the device as out-of-service and notify clinical staff

A non-functional alarm on a safety-critical device like an infusion pump means it must be taken out of service immediately until repaired and verified.

Question 66: In the context of biomedical equipment used during surgery, which nerve plexus supplies the brachial region and is a landmark for regional anesthesia?

Cervical plexus
Lumbar plexus
Brachial plexus (Correct answer)
Sacral plexus

Correct answer: Brachial plexus

The brachial plexus (C5–T1) innervates the upper extremity and is the target for brachial plexus nerve blocks used in upper limb surgeries.

Question 67: Which CMS Condition of Participation requires hospitals to have an ongoing program for maintaining medical equipment?

482.45 – Organ, Tissue, and Eye Procurement
482.41(c) – Equipment Maintenance (Correct answer)
482.13 – Patient Rights
482.41 – Physical Environment

Correct answer: 482.41(c) – Equipment Maintenance

CMS CoP 482.41(c) requires hospitals to maintain and inspect equipment to ensure safety for patients and personnel.

Question 68: Which NFPA 99 category designation applies to spaces where failure of equipment is likely to cause major injury or death to patients or caregivers?

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

Correct answer: Category 1

NFPA 99 Category 1 (formerly 'critical care') covers areas where equipment failure could result in major injury or death.

Question 69: A biomedical technologist notices that an ultrasound image shows a bright echo directly behind a highly reflective structure. This is best described as:

Reverberation artifact (Correct answer)
Posterior acoustic enhancement
Acoustic shadowing
Mirror image artifact

Correct answer: Reverberation artifact

Reverberation artifact appears as multiple equally spaced bright lines behind a strongly reflective interface due to sound bouncing back and forth.

Question 70: During installation of a patient monitoring system, the technician discovers the network port assignment conflicts with an existing device on the LAN. Who should be contacted to resolve this?

The nursing supervisor
The Joint Commission surveyor
The equipment manufacturer only
The hospital's IT/biomedical informatics department (Correct answer)

Correct answer: The hospital's IT/biomedical informatics department

Network IP address and port conflicts must be resolved by the hospital IT or biomedical informatics team who manage the clinical network infrastructure.

Question 71: Which anatomical structure separates the thoracic cavity from the abdominal cavity and is the primary muscle of respiration?

Transversus abdominis
Diaphragm (Correct answer)
Internal intercostal muscles
External oblique muscle

Correct answer: Diaphragm

The diaphragm is a dome-shaped musculotendinous partition between the thorax and abdomen; its contraction increases thoracic volume to drive inspiration.

Question 72: How frequently should ongoing assessments be conducted in Certified Associate in Biomedical Technology practice?

Only when required by external auditors
Only when problems are reported
At regular intervals based on established protocols and as conditions change (Correct answer)
Once annually regardless of circumstances

Correct answer: At regular intervals based on established protocols and as conditions change

Ongoing assessments should follow established protocols for regular intervals and also be conducted when conditions change. This balanced approach ensures continuous monitoring while remaining responsive to new developments.

Question 73: A pulse oximeter provides an SpO2 reading by measuring the differential absorption of two wavelengths of light. Which operational principle allows the device to distinguish between arterial and venous blood?

The device only analyzes the pulsatile component of the light absorption, which corresponds to arterial blood flow. (Correct answer)
It measures the static (non-changing) absorption from all tissues and subtracts a baseline value.
The probe heats the tissue, which temporarily increases arterial flow for a more accurate measurement.
It uses a third wavelength of light to specifically isolate and cancel out the signal from venous blood.

Correct answer: The device only analyzes the pulsatile component of the light absorption, which corresponds to arterial blood flow.

A pulse oximeter identifies arterial blood by detecting the pulsatile nature of its flow, which corresponds to the heartbeat. The device measures the light absorption during both the systolic (pulse) and diastolic (no pulse) phases. The changing, or AC component, of the signal is attributed to the pulsatile arterial blood, while the constant, or DC component, is from non-pulsatile venous blood and tissue. By focusing only on the AC component, it can accurately calculate arterial oxygen saturation (SpO2).

Question 74: Which class of electrical equipment relies solely on basic insulation for protection and has no grounding conductor?

Class I
Class 0 (Correct answer)
Class II
Class III

Correct answer: Class 0

Class 0 equipment relies only on basic insulation with no additional safety measure such as grounding or protective extra-low voltage.

Question 75: What type of document provides procedures for maintenance?

Service manual (Correct answer)
Invoice
Warranty card
User survey

Correct answer: Service manual

A service manual is an essential document that provides detailed procedures and instructions for the maintenance, troubleshooting, and repair of a specific biomedical device. It typically includes schematics, parts lists, calibration procedures, and safety guidelines. Biomedical technicians rely heavily on service manuals to perform accurate and effective maintenance and repairs, ensuring the device operates correctly and safely.

Question 76: Which ventilator mode delivers a set tidal volume regardless of airway resistance or compliance changes?

Airway Pressure Release Ventilation (APRV)
Volume Control Ventilation (VCV) (Correct answer)
Pressure Support Ventilation (PSV)
Continuous Positive Airway Pressure (CPAP)

Correct answer: Volume Control Ventilation (VCV)

Volume Control Ventilation delivers a fixed tidal volume with each breath, with airway pressure varying based on lung mechanics.

Question 77: An infusion pump alarms 'upstream occlusion.' What is the most likely cause?

Air in the IV line
Kinked IV tubing above the pump (Correct answer)
Depleted battery
Incorrect drug concentration entered

Correct answer: Kinked IV tubing above the pump

An upstream occlusion alarm typically indicates a blockage or kink in the tubing between the fluid bag and the pump, preventing fluid from reaching the pump.

Question 78: What is the time constant (τ) of an RC circuit with R = 10 kΩ and C = 100 µF?

10 seconds
100 seconds
1 second (Correct answer)
0.1 seconds

Correct answer: 1 second

τ = RC = 10,000 Ω × 0.0001 F = 1 second.

Question 79: Which of the following is a primary objective of a scheduled Preventive Maintenance (PM) program for medical equipment?

To train clinical staff on proper device usage.
To exclusively perform software updates on devices.
To respond to equipment failures as they occur.
To ensure equipment safety and reduce the likelihood of failure. (Correct answer)

Correct answer: To ensure equipment safety and reduce the likelihood of failure.

The core purpose of a preventive maintenance program is to proactively inspect, test, calibrate, and service equipment at regular intervals. This process aims to identify and correct potential problems before they lead to equipment failure, thereby enhancing patient safety and equipment reliability.

Question 80: A Holter monitor recording shows frequent artifact. The MOST common cause of motion artifact in ambulatory ECG monitoring is:

Battery depletion mid-recording
Loose or improperly prepped electrode-skin interface (Correct answer)
Magnetic interference from the patient's environment
Incorrect lead polarity assignment

Correct answer: Loose or improperly prepped electrode-skin interface

Poor skin preparation (oil, hair, moisture) and loose electrodes cause the majority of Holter motion artifacts by introducing impedance fluctuations.

Question 81: Which regulatory body oversees the accreditation of healthcare organizations in the United States and evaluates compliance with safety standards?

CMS
FDA
The Joint Commission (TJC) (Correct answer)
OSHA

Correct answer: The Joint Commission (TJC)

The Joint Commission accredits and certifies healthcare organizations, evaluating compliance with performance standards to improve patient care quality and safety.

Question 82: A coagulation analyzer displays a 'clot detect error' on a patient sample. The MOST likely cause is:

Expired control material
Low ambient temperature in the lab
Insufficient sample volume or presence of a fibrin clot in the sample (Correct answer)
Wrong reagent lot number loaded

Correct answer: Insufficient sample volume or presence of a fibrin clot in the sample

Clot detect errors are most commonly caused by insufficient sample volume or fibrin strands/microclots in the specimen that interfere with the optical or mechanical clot detection system.

Question 83: When returning a repaired biomedical device to service, the technician must ensure that:

Only the clinical staff approve the return
Only the repaired component is tested
All safety tests are completed, results are documented, and the device is labeled appropriately (Correct answer)
The device is returned as quickly as possible without documentation

Correct answer: All safety tests are completed, results are documented, and the device is labeled appropriately

Post-repair safety testing, complete documentation of results, and appropriate device labeling are all required before a device is returned to clinical service.

Question 84: In digital-to-analog conversion, the term 'settling time' refers to:

Propagation delay through digital logic
Time for the ADC to complete one conversion
Time for the DAC output to reach and stay within a specified accuracy band after a code change (Correct answer)
Time constant of the output filter

Correct answer: Time for the DAC output to reach and stay within a specified accuracy band after a code change

Settling time is the time required for the DAC output to settle within a defined error band (e.g., ±½ LSB) after the digital input changes.

Question 85: What is the purpose of electrical isolation in patient-connected biomedical equipment?

To improve signal bandwidth
To reduce power consumption
To increase signal gain
To prevent leakage current from passing through the patient (Correct answer)

Correct answer: To prevent leakage current from passing through the patient

Electrical isolation prevents potentially lethal leakage currents from flowing through the patient by breaking the direct electrical connection between the equipment and the patient.

Question 86: Which interference source is most likely to cause an artifact that mimics ventricular fibrillation on an ECG monitor?

Patient talking or coughing
Low battery in the wireless transmitter
Use of a non-standard electrode gel
60 Hz AC interference from a faulty electrode or lead wire (Correct answer)

Correct answer: 60 Hz AC interference from a faulty electrode or lead wire

Severe 60 Hz AC interference can produce a coarse, irregular waveform on the ECG that visually resembles ventricular fibrillation, requiring electrode and lead wire inspection.

Question 87: In a pulse oximeter, which two wavelengths of light are used to differentiate oxyhemoglobin from deoxyhemoglobin?

550 nm and 850 nm
450 nm and 580 nm
780 nm and 1000 nm
660 nm and 940 nm (Correct answer)

Correct answer: 660 nm and 940 nm

Pulse oximeters use red light (~660 nm) and infrared light (~940 nm) because oxyhemoglobin and deoxyhemoglobin absorb these wavelengths at different ratios.

Question 88: A defibrillator capacitor stores 360 joules at 5000 V. What is the capacitance value?

72 µF
14.4 µF
144 µF
28.8 µF (Correct answer)

Correct answer: 28.8 µF

Energy E = ½CV², so C = 2E/V² = 2×360/(5000²) = 28.8 µF.

Question 89: Which combining form refers to the kidney?

Cholecyst/o
Hepat/o
Nephr/o (Correct answer)
Gastr/o

Correct answer: Nephr/o

'Nephr/o' is the combining form for kidney, used in words like nephrology and nephritis.

Question 90: A CBET notices a patient monitor displaying erratic readings after a nearby surgical cautery unit is activated. This interference is best categorized as:

Common-mode noise
Electrostatic discharge
Conducted emissions
Radiated susceptibility (immunity failure) (Correct answer)

Correct answer: Radiated susceptibility (immunity failure)

When a device malfunctions due to electromagnetic energy radiated from a nearby source, this is a radiated susceptibility or immunity failure.

Question 91: The 'source leakage current' measured during medical device safety testing represents current flowing:

Through the signal output connector only
Between two pieces of equipment connected in series
From the power source through the chassis to ground without any external patient load (Correct answer)
From the patient leads to the neutral wire

Correct answer: From the power source through the chassis to ground without any external patient load

Source leakage current (also called chassis or enclosure leakage) flows from the power-line conductors through insulation to the chassis and then to ground.

Question 92: What is the primary purpose of a preventive maintenance (PM) schedule for biomedical equipment?

To ensure equipment performs safely and reliably between corrective repairs (Correct answer)
To satisfy insurance requirements only
To reduce the purchase cost of new equipment
To train new technicians on equipment operation

Correct answer: To ensure equipment performs safely and reliably between corrective repairs

Preventive maintenance ensures equipment continues to operate safely and reliably by identifying and correcting potential issues before they cause failure.

Question 93: Which of the following best describes the role of surfactant in the lungs?

Filters particulates from inhaled air
Facilitates gas exchange across the alveolar membrane
Carries oxygen from alveoli to blood
Reduces surface tension to prevent alveolar collapse (Correct answer)

Correct answer: Reduces surface tension to prevent alveolar collapse

Surfactant, produced by type II pneumocytes, reduces surface tension in alveoli, preventing collapse during exhalation.

Question 94: Which safety feature prevents a centrifuge from operating when the lid is open?

Speed governor
Ground fault circuit interrupter
Thermal overload relay
Interlock switch (Correct answer)

Correct answer: Interlock switch

An interlock switch (lid interlock) is a safety mechanism that disables centrifuge operation whenever the lid is opened, preventing rotor exposure.

Question 95: A syringe pump is programmed for 5 mL/hr but delivers only 2 mL/hr. Which mechanical issue is most likely responsible?

Low battery condition
Incorrect syringe size selected in the pump settings (Correct answer)
Incorrect drug concentration label
Upstream occlusion alarm muted

Correct answer: Incorrect syringe size selected in the pump settings

If the wrong syringe size is selected, the pump miscalculates the plunger travel distance needed, resulting in significant delivery errors.

Question 96: The primary safety function of a line isolation monitor (LIM) in an isolated power system is to:

Automatically shut off power during equipment failure
Regulate voltage to critical care outlets
Detect and alarm when hazard current to ground exceeds a safe threshold (Correct answer)
Prevent voltage surges from damaging equipment

Correct answer: Detect and alarm when hazard current to ground exceeds a safe threshold

A LIM continuously measures impedance to ground and alarms when leakage current exceeds ~2 mA, warning of a fault before a second fault can cause patient electrocution.

Question 97: For cardiac catheterization laboratory equipment, NFPA 99 specifies a maximum patient lead leakage current of:

100 µA
10 µA (Correct answer)
500 µA
50 µA

Correct answer: 10 µA

In critical care (Category 1) areas with intracardiac leads, the patient lead leakage limit is 10 µA to prevent microshock-induced fibrillation.

Question 98: What does the suffix '-plasty' indicate in medical terminology?

Surgical repair or reconstruction (Correct answer)
Incision into
Inflammation of
Disease of

Correct answer: Surgical repair or reconstruction

'-Plasty' indicates a surgical procedure involving repair, reconstruction, or reshaping of a structure.

Question 99: What is the purpose of 'PEEP' in mechanical ventilation?

To increase inspiratory flow rate
To trigger a breath when the patient makes an inspiratory effort
To limit the maximum airway pressure during inspiration
To maintain positive pressure in the airway at end-expiration and prevent alveolar collapse (Correct answer)

Correct answer: To maintain positive pressure in the airway at end-expiration and prevent alveolar collapse

Positive End-Expiratory Pressure (PEEP) keeps a baseline positive pressure in the airways at the end of exhalation, preventing alveolar collapse and improving oxygenation.

Question 100: What is the correct procedure when disposing of a mercury-containing sphygmomanometer that is no longer in service?

Follow facility hazardous waste protocols for mercury disposal (Correct answer)
Return it to the manufacturer without any special precautions
Disassemble it and discard components separately
Place it in regular medical waste

Correct answer: Follow facility hazardous waste protocols for mercury disposal

Mercury is a hazardous material subject to EPA regulations; it must be disposed of through the facility's hazardous waste management program.

Question 101: A patient is connected to a dialysis machine. This machine is performing the primary function of which anatomical organ?

Pancreas
Liver
Spleen
Kidneys (Correct answer)

Correct answer: Kidneys

The kidneys are the primary organs of the excretory system, responsible for filtering waste products from the blood and producing urine. A dialysis machine is an artificial replacement for this essential function when the kidneys fail.

Question 102: Which section of the small intestine is the primary site for nutrient absorption?

Jejunum (Correct answer)
Duodenum
Ileum
Cecum

Correct answer: Jejunum

The jejunum has extensive villi and microvilli (brush border) and is the primary site for absorption of carbohydrates, proteins, and most nutrients.

Question 103: During phlebotomy, the tourniquet should be released within what timeframe to prevent hemoconcentration artifacts in laboratory results?

5 minutes
2 minutes
30 seconds
1 minute (Correct answer)

Correct answer: 1 minute

Tourniquets should be released within 1 minute of application to prevent hemoconcentration, which can falsely elevate cell counts, proteins, and other analytes.

Question 104: The combining form 'cardi/o' refers to which organ?

Heart (Correct answer)
Liver
Lung
Kidney

Correct answer: Heart

'Cardi/o' refers to the heart and is used in terms like cardiogram and cardiology.

Question 105: Which anatomical term describes the movement of a limb away from the midline of the body?

Adduction
Circumduction
Inversion
Abduction (Correct answer)

Correct answer: Abduction

Abduction is the movement of a body part away from the midline, while adduction moves it toward the midline.

Question 106: In a biomedical device, a zener diode is used primarily to:

Rectify AC to DC
Regulate voltage (Correct answer)
Store electrical charge
Amplify small signals

Correct answer: Regulate voltage

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

Question 107: A GFCI (Ground Fault Circuit Interrupter) trips when it detects a current imbalance greater than:

1 mA
15 mA
30 mA
4–6 mA (Correct answer)

Correct answer: 4–6 mA

A GFCI monitors the difference between hot and neutral currents and trips when the imbalance exceeds approximately 4–6 mA, indicating ground fault current.

Question 108: Which color is used in the US to identify the grounding conductor in a standard electrical cord?

Red
White
Green or bare copper (Correct answer)
Black

Correct answer: Green or bare copper

In the United States, the protective ground conductor is identified by green insulation or left as bare copper wire.

Question 109: A biomedical technician calibrates a glucometer. Which organ is primarily responsible for regulating blood glucose through glycogen storage and release?

Liver (Correct answer)
Adrenal gland
Skeletal muscle
Pancreas

Correct answer: Liver

The liver stores glucose as glycogen (glycogenesis) and releases glucose via glycogenolysis and gluconeogenesis to maintain blood glucose homeostasis.

Question 110: Which directional term means closer to the point of attachment or origin?

Distal
Proximal (Correct answer)
Inferior
Lateral

Correct answer: Proximal

Proximal describes a structure closer to the point of origin or attachment, such as the proximal end of the femur near the hip.

Question 111: Which lubricant is generally recommended for O-rings in medical gas equipment?

Lithium grease
Petroleum-based grease
Silicone-based lubricant (Correct answer)
Petroleum jelly (Vaseline)

Correct answer: Silicone-based lubricant

Silicone-based lubricants are oxygen-compatible and are recommended for O-rings in medical gas systems; petroleum-based products are fire hazards with oxygen.

Question 112: Under NFPA 99, receptacles in a Category 1 (critical care) patient care area must be:

Standard duplex GFCI protected only
Color-coded blue for identification purposes
Twist-lock to prevent accidental disconnection
Hospital-grade and connected to the equipment grounding system (Correct answer)

Correct answer: Hospital-grade and connected to the equipment grounding system

NFPA 99 requires hospital-grade receptacles in Category 1 areas to ensure reliable grounding and mechanical integrity under clinical conditions.

Question 113: According to The Joint Commission Environment of Care (EC) standards, medical equipment management plans must include:

Criteria for identifying, evaluating, and taking inventory of equipment before use (Correct answer)
A requirement that all PMs are performed by OEM-certified technicians only
Mandatory replacement of all equipment older than 10 years
Monthly audits by the state health department

Correct answer: Criteria for identifying, evaluating, and taking inventory of equipment before use

TJC EC standards require that the equipment management plan define criteria for identifying, evaluating, and inventorying equipment prior to its initial use.

Question 114: A hospital-grade power strip designated for patient care areas must have which feature that standard power strips lack?

Wi-Fi connectivity for remote monitoring
Hospital-grade plugs and receptacles with higher retention force and safety ratings (Correct answer)
A built-in surge protector with LED indicator
USB charging ports

Correct answer: Hospital-grade plugs and receptacles with higher retention force and safety ratings

Hospital-grade power strips must use hospital-grade outlets and plugs that meet UL 1363A standards, providing superior retention force, grounding reliability, and patient safety compliance.

Question 115: The term 'slew rate' in an operational amplifier refers to:

Maximum rate of change of output voltage (Correct answer)
Maximum output voltage swing
Gain-bandwidth product
Input offset voltage drift

Correct answer: Maximum rate of change of output voltage

Slew rate is the maximum rate at which the op-amp output voltage can change, typically expressed in V/µs, limiting high-frequency large-signal performance.

Question 116: Under the Safe Medical Devices Act (SMDA), which facilities are required to report device-related adverse events to the FDA?

Only device manufacturers
Only outpatient clinics and ambulatory surgery centers
User facilities such as hospitals and nursing homes (Correct answer)
Manufacturers and importers only

Correct answer: User facilities such as hospitals and nursing homes

The SMDA requires user facilities, including hospitals and nursing homes, to report device-related deaths and serious injuries to the FDA and/or manufacturer.

Question 117: A new biomedical technician is looking for a comprehensive, consensus-based standard on recommended practices for electrical safety testing and medical equipment management in a healthcare facility. Which organization would be the primary source for this type of guidance?

The Occupational Safety and Health Administration (OSHA).
The National Fire Protection Association (NFPA).
The Association for the Advancement of Medical Instrumentation (AAMI). (Correct answer)
The Joint Commission (TJC).

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

While NFPA (specifically NFPA 99) and TJC are critical for regulations and accreditation, AAMI is the primary organization that develops detailed, consensus-based standards (like ANSI/AAMI EQ56) and technical information reports (TIRs) specifically for the testing, maintenance, and management of medical instrumentation.

Question 118: A surgical team reports that the monopolar electrosurgery unit (ESU) causes interference with an implanted cardiac pacemaker. The SAFEST recommendation is to:

Disable pacemaker sensing mode during surgery
Place the dispersive pad as close to the ESU active electrode as possible
Use bipolar electrosurgery and keep ESU current path away from the pacemaker (Correct answer)
Increase ESU power to reduce activation time

Correct answer: Use bipolar electrosurgery and keep ESU current path away from the pacemaker

Bipolar electrosurgery confines current to a small local area, greatly reducing electromagnetic interference with implanted devices compared to monopolar current paths.

Question 119: Which artifact in MRI is caused by the difference in resonant frequencies between water and fat protons?

Motion artifact
Gibbs ringing artifact
Susceptibility artifact
Chemical shift artifact (Correct answer)

Correct answer: Chemical shift artifact

Chemical shift artifact occurs because water and fat protons precess at slightly different frequencies, causing a spatial misregistration at tissue interfaces.

Question 120: During a survey, The Joint Commission (TJC) is evaluating a hospital's Medical Equipment Management Plan. Which of the following is a critical performance metric TJC will review to ensure equipment safety and reliability?

The number of new medical devices acquired in the last fiscal year.
The average cost of repairs for each device category.
The on-time completion percentage for scheduled equipment maintenance. (Correct answer)
The brand of test equipment used for preventive maintenance procedures.

Correct answer: The on-time completion percentage for scheduled equipment maintenance.

The Joint Commission emphasizes proactive risk management. A key indicator of a healthy Medical Equipment Management Plan is a high completion rate for scheduled preventive maintenance (PM). This demonstrates the hospital is actively maintaining its equipment to ensure it is safe and functions as intended, which directly impacts patient safety.

CABT Certified Associate in Biomedical Technology Exam

The CABT Certified Associate in Biomedical Technology Exam validates foundational competencies in biomedical equipment technology, including installation, maintenance, troubleshooting, anatomy, electronics, patient safety, and healthcare regulations.

120

Questions

120 min

Time Limit

70%

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