CBET Electronics and Electrical Safety 3

Question 1

What does the acronym GFCI stand for, and what is its primary function in healthcare facilities?

Accepted Answer

Ground Fault Circuit Interrupter - detects imbalance between hot and neutral conductors and disconnects power

Answer

A GFCI monitors current flow between hot and neutral conductors. If it detects an imbalance of approximately 5 milliamps, it disconnects power within milliseconds.

Question 2

In troubleshooting a medical device power supply, you measure 0V DC output but 120V AC input is present. Which component is most likely failed?

Accepted Answer

Bridge rectifier or filter capacitor

Answer

With AC input present but no DC output, the AC-to-DC conversion stage has failed. The bridge rectifier or filter capacitor are the most likely culprits.

Question 3

What is the minimum recommended testing frequency for electrical safety inspections of patient care equipment according to NFPA 99?

Accepted Answer

Annually

Answer

NFPA 99 recommends electrical safety testing at least annually, though more frequent testing may be required based on risk assessment.

Question 4

What is the purpose of a snubber circuit across relay contacts in medical equipment?

Accepted Answer

To suppress voltage spikes caused by inductive load switching

Answer

A snubber circuit suppresses voltage transients generated when relay contacts open and interrupt current to an inductive load.

Question 5

What does the term 'equipotential grounding' mean in the context of a hospital operating room?

Accepted Answer

All conductive surfaces within patient reach are connected to a common ground point

Answer

Equipotential grounding ensures that all conductive surfaces within patient reach are bonded to a single ground reference point, eliminating dangerous potential differences.

CBET - Certified Biomedical Equipment Technician Practice Test

CBET - Certified Biomedical Equipment Technician Practice Test

CBET Electronics and Electrical Safety 3