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What is a PMMC instrument?

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What is a PMMC instrument?

(a) Permanent moving magnet coil instrument

(b) Permanent machine magnet coil instrument

(c) Permanent moving machine coil instrument

(d) Premature moving magnet coil instrument

This question was addressed to me in an interview for job.

Question is from Determination of the B/H Characteristic topic in portion Simple Magnetic Circuits of Basic Electrical Engineering

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Correct answer is (a) Permanent moving magnet coil instrument

Explanation: A PMMC instrument is a permanent moving magnet coil instrument. It uses two magnets to create a stationary magnetic field.

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