CABT Biomedical Equipment Technology & Function 2

Question 1

Which type of defibrillator waveform is now preferred over monophasic due to its lower energy requirements and higher first-shock efficacy?

Accepted Answer

Biphasic truncated exponential

Answer

Biphasic waveforms deliver current in two phases, reducing myocardial damage and improving defibrillation success at lower energy levels.

Question 2

An infusion pump alarming 'occlusion downstream' most likely indicates:

Accepted Answer

A kinked or clamped IV tubing distal to the pump

Answer

A downstream occlusion alarm triggers when back-pressure exceeds the set threshold, typically caused by a clamp, kink, or infiltration at the IV site.

Question 3

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

Accepted Answer

660 nm and 940 nm

Answer

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

Question 4

A ventilator's tidal volume is set to 500 mL but the measured exhaled volume is consistently 450 mL. The FIRST step a BMET should check is:

Accepted Answer

Inspect the breathing circuit for leaks

Answer

A consistent volume discrepancy between set and measured tidal volumes most commonly results from a circuit leak, which should be ruled out before replacing components.

Question 5

Which component in an electrosurgical unit (ESU) converts standard AC line power into the high-frequency RF current used for cutting and coagulation?

Accepted Answer

Resonant tank circuit

Answer

The resonant tank circuit (oscillator) in an ESU generates high-frequency RF output (typically 300 kHz–5 MHz) from the rectified DC supply.

(CABT) Certified Associate in Biomedical Technology Practice Test

(CABT) Certified Associate in Biomedical Technology Practice Test

CABT Biomedical Equipment Technology & Function 2