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Moving Iron Instrument can be used as ____________

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Moving Iron Instrument can be used as ____________

(a) An ammeter for measuring DC as well as AC

(b) For measuring DC current and voltages only

(c) An ammeter and a voltmeter for measuring DC as well as AC

(d) For measuring AC current and voltages only

The question was posed to me during an interview.

Question is taken from Advanced Problems on Indicating Instruments topic in portion Extension of Instrument Ranges of Electrical Measurements

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The correct choice is (c) An ammeter and a voltmeter for measuring DC as well as AC

The explanation is: When the instrument is connected in the circuit, the current flows through the coil. These currents set up a magnetic field in the coil. The result is that the pointer attached to the moving system moves from zero position. If the current in the coil is reversed, the direction of deflecting torque remains unchanged. Therefore, these instruments can be used for both DC as well as AC measurements.

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