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 0 equipment relies only on basic insulation with no additional safety measure such as grounding or protective extra-low voltage.

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

NFPA 99 allows a maximum chassis leakage current of 100 µA for patient-connected devices in general care (Category 2) areas.

Question 3

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

Accepted Answer

Microshock from potential differences between grounded surfaces

Answer

Equipotential grounding ensures all conductive surfaces in a patient care area are at the same potential, preventing microshock from small current flow through the patient.

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

A broken ground pin eliminates the primary fault-current path, creating a shock hazard; the device must be removed from service immediately.

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

A megohmmeter applies a high DC test voltage (typically 500 V) and measures the resulting resistance to assess insulation integrity.

(CABT) Certified Associate in Biomedical Technology Practice Test

(CABT) Certified Associate in Biomedical Technology Practice Test

CABT Healthcare and Electrical Safety 2