CBET Basic 4

Question 1

What does the term 'impedance' represent in an AC circuit?

Accepted Answer

The total opposition to AC current including resistance, inductance, and capacitance

Answer

Only the resistive opposition to current flow

Answer

The ratio of inductance to capacitance

Answer

The phase difference between voltage and current

Question 2

In a hospital power system, what color is the equipment grounding conductor per NEC standards?

Accepted Answer

Green or bare

Answer

White or gray

Answer

Black

Answer

Red

Question 3

Which physiological signal has the lowest typical amplitude among the following?

Accepted Answer

EEG (electroencephalogram)

Answer

ECG (electrocardiogram)

Answer

EMG (electromyogram)

Answer

EOG (electrooculogram)

Question 4

What is the half-value layer (HVL) in radiological physics?

Accepted Answer

The thickness of material needed to reduce radiation intensity by half

Answer

The depth at which radiation intensity doubles

Answer

The energy at which photons are most absorbed

Answer

The maximum safe exposure dose per year

Question 5

Which component is used to measure very small DC currents in biomedical instruments by converting them to a voltage?

Accepted Answer

Transimpedance amplifier (current-to-voltage converter)

Answer

Wheatstone bridge

Answer

Differential amplifier

Answer

Sample-and-hold circuit

Question 6

What does CMRR measure in a differential amplifier?

Accepted Answer

The ability to reject signals common to both inputs while amplifying the difference

Answer

The bandwidth of the amplifier at 3 dB down

Answer

The ratio of output noise to input signal

Answer

The maximum supply voltage the amplifier can tolerate

Question 7

When performing preventive maintenance on an infusion pump, which test verifies the accuracy of fluid delivery rate?

Accepted Answer

Gravimetric flow rate test

Answer

Dielectric strength test

Answer

Hipot test

Answer

Ground bond resistance test