CBET General Practice 3

Question 1

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

Accepted Answer

Carbon monoxide poisoning causing carboxyhemoglobin

Answer

Hypothermia reducing peripheral perfusion

Answer

Anemia with normal oxygen saturation

Answer

Motion artifact from patient tremors

Question 2

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

Accepted Answer

Prevent external RF signals from interfering with MRI signals

Answer

Shield patients from ionizing radiation

Answer

Ground all electrical equipment simultaneously

Answer

Reduce acoustic noise during MRI scanning

Question 3

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

Accepted Answer

Ensure measurements are accurate relative to a national standard

Answer

Save time compared to manufacturer weights

Answer

Satisfy Joint Commission aesthetic requirements

Answer

Avoid purchasing manufacturer-specific calibration kits

Question 4

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

Accepted Answer

Overvoltage on some phases damaging connected equipment

Answer

Nuisance tripping of circuit breakers

Answer

Reduced power consumption by the equipment

Answer

Increased ground fault current

Question 5

A surgical electrosurgical unit (ESU) causes interference on a nearby patient monitor. The FIRST corrective action should be:

Accepted Answer

Check and ensure proper placement and contact of the ESU dispersive electrode

Answer

Replace the patient monitor

Answer

Install a new ESU with digital output

Answer

Move the patient monitor to a different room

Question 6

Which parameter is checked during an acceptance test for a defibrillator to verify energy delivery accuracy?

Accepted Answer

Delivered energy measured with a calibrated defibrillator analyzer

Answer

Charge time to maximum energy

Answer

Battery voltage at rest

Answer

Electrode impedance in open air

Question 7

Which law governs the relationship between pressure, volume, and temperature for an ideal gas, relevant to medical gas cylinders?

Accepted Answer

The Combined Gas Law (Boyle's + Charles' Laws)

Answer

Ohm's Law

Answer

Bernoulli's Principle

Answer

Poiseuille's Law