CBET Electronics and Electrical Safety 4

Question 1

What is the maximum allowable chassis leakage current for a patient-connected device in a general care area according to NFPA 99?

Accepted Answer

100 µA

Answer

500 µA

Answer

10 µA

Answer

300 µA

Question 2

A Zener diode is primarily used in electronic circuits to:

Accepted Answer

Regulate voltage

Answer

Amplify small signals

Answer

Rectify AC to DC

Answer

Filter high-frequency noise

Question 3

Which type of transformer configuration is used in medical-grade isolated power systems to prevent shock hazard?

Accepted Answer

Isolation transformer

Answer

Autotransformer

Answer

Step-down transformer

Answer

Toroidal transformer

Question 4

In a series RLC circuit at resonance, the impedance is:

Accepted Answer

Minimum and purely resistive

Answer

Maximum and purely resistive

Answer

Zero

Answer

Equal to inductive reactance only

Question 5

What does the term 'macroshock' refer to in electrical safety?

Accepted Answer

Large current entering the body through the skin

Answer

Current applied directly to the heart via a catheter

Answer

Electrostatic discharge from equipment surfaces

Answer

Current leakage below 10 µA

Question 6

A hospital-grade receptacle differs from a standard commercial receptacle primarily by:

Accepted Answer

Green dot marking and reinforced contacts

Answer

Higher voltage rating

Answer

Three-phase wiring capability

Answer

Built-in GFCI protection

Question 7

Which logic gate outputs HIGH only when all inputs are HIGH?

Accepted Answer

AND gate

Answer

OR gate

Answer

NAND gate

Answer

NOR gate