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

The power cord ground pin to chassis

Answer

The chassis to the neutral conductor

Answer

The power line to the chassis

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

Increase power supply output voltage

Answer

Provide gain to the digital signal

Answer

Convert AC to DC for the IC

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

Comparator

Answer

Differentiator

Answer

Voltage regulator

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

Overvoltage on the supply line

Answer

Excessive current draw by connected equipment

Answer

Reverse polarity wiring

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

Equal (1×)

Answer

Half (0.5×)

Answer

Four times (4×)

Question 6

According to electrical safety standards, the ground wire in a medical device power cord must be:

Accepted Answer

The same gauge as the hot conductor

Answer

A larger gauge than the hot and neutral conductors

Answer

Optional if a double-insulated design is used

Answer

Connected to the chassis only, not the plug ground pin

Question 7

Thermal runaway in a bipolar junction transistor (BJT) is caused by:

Accepted Answer

Positive feedback between temperature rise and collector current increase

Answer

Excessive base current limiting resistance

Answer

Breakdown of the emitter-base junction at low voltages

Answer

Capacitive coupling between collector and base