CBET Electronics and Electrical Safety 5

Question 1

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

Accepted Answer

Applied parts to the equipment ground

Answer

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

Question 2

What is the function of a decoupling capacitor placed near an IC power pin?

Accepted Answer

Filter high-frequency noise on the supply rail

Answer

Decoupling capacitors suppress high-frequency transients and noise on the supply voltage rail, stabilizing IC operation.

Question 3

An op-amp configured with the non-inverting input connected to a voltage divider and output fed back to the inverting input is functioning as a:

Accepted Answer

Voltage follower (buffer)

Answer

When the output feeds directly back to the inverting input with no other feedback components, the op-amp becomes a unity-gain voltage follower.

Question 4

Which condition does a Line Isolation Monitor (LIM) detect in an isolated power system?

Accepted Answer

First fault to ground in the isolated circuit

Answer

A LIM continuously monitors the impedance from the isolated conductors to ground and alarms when the first fault reduces isolation below safe limits.

Question 5

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

Accepted Answer

Double (2×)

Answer

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

CBET - Certified Biomedical Equipment Technician Practice Test