Marine Electrical Systems USCG Question #1141 (Set 38)

In testing a hand cranked megger prior to use, what statement is true?

Official USCG Answer & Rule Citation

Correct Answer: Option C — With the test leads shorted, the pointer should go to zero ohms, and with the tests leads open, the pointer should go to infinite ohms.

A hand-cranked megger generates its own voltage. With leads shorted, it indicates zero ohms (continuity). With leads open, it indicates infinite ohms (insulation failure). This behavior is crucial for verifying megger functionality before insulation resistance testing, as per IEEE 45 guidelines.

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