CABT Healthcare and Electrical Safety 2

Question 1

Which class of electrical equipment relies solely on basic insulation for protection and has no grounding conductor?

Accepted Answer

Class 0

Answer

Class I

Answer

Class II

Answer

Class III

Question 2

The maximum allowable chassis leakage current for a patient-connected device in a general care area per NFPA 99 is:

Accepted Answer

100 µA

Answer

10 µA

Answer

500 µA

Answer

1 mA

Question 3

In a patient care environment, 'equipotential grounding' primarily protects against:

Accepted Answer

Microshock from potential differences between grounded surfaces

Answer

Voltage surges from lightning

Answer

Radio-frequency interference

Answer

Electrostatic discharge from staff clothing

Question 4

A biomedical technician discovers that the ground pin of a 3-prong medical device plug is broken. The safest immediate action is to:

Accepted Answer

Tag out the device and remove it from service

Answer

Replace the fuse and return to service

Answer

Use a 2-to-3 prong adapter until parts arrive

Answer

Continue use if the device passes a visual inspection

Question 5

Which test instrument is used to measure the insulation resistance of medical electrical equipment to detect degraded insulation?

Accepted Answer

Megohmmeter (megger)

Answer

Clamp meter

Answer

Oscilloscope

Answer

Digital multimeter set to AC volts

Question 6

When performing an electrical safety inspection, a 'point of care' device is found to have a leakage current of 450 µA chassis-to-ground. This finding indicates:

Accepted Answer

A safety hazard requiring removal from service

Answer

Normal; within all accepted limits

Answer

Elevated; exceeds the 100 µA general care limit but acceptable in critical care

Answer

Acceptable only if the device is double-insulated

Question 7

The purpose of an isolation transformer in a line isolation monitor (LIM) system is to:

Accepted Answer

Isolate the power circuit from earth ground to reduce shock hazard

Answer

Step down voltage to 12 V for patient circuits

Answer

Filter harmonics from medical imaging equipment

Answer

Provide backup power during an outage