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Which of the following instruments cannot be applied for ac measurements?

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Which of the following instruments cannot be applied for ac measurements?

(a) Hot wire

(b) PMMC

(c) Electrostatic

(d) Induction type

I have been asked this question in an interview.

Query is from The Rectifier Voltmeter in division Application of Diodes of Electronic Devices & Circuits

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Best answer
The correct option is (b) PMMC

The best explanation: The moving coil instrument can only be used on D.C supply as the reversal of current produces a reversal of torque on the coil. It’s very delicate and sometimes uses AC circuit with a rectifier. It’s costly as compared to moving coil iron instruments.

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