Marine Electrical Systems USCG Question #642 (Set 22)

The leads from a ohmmeter are attached to the leads of the opposite ends of an AC motor stator field coil. If a reading of infinity is obtained, what does this indicate?

Official USCG Answer & Rule Citation

Correct Answer: Option D — open field coil

An ohmmeter measures electrical resistance. A reading of infinity indicates complete electrical discontinuity or an infinite gap, signifying an open circuit within the stator field coil where the wire has broken or burned completely apart.

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