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MCQ Practice Question
Measurements & InstrumentationAnalog Instruments

A moving-iron instrument can normally be used for?

  • ABoth AC and DC
  • BDC only
  • CAC only above 1 MHz
  • DTemperature only
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Correct Answer: A. Both AC and DC
Explanation: Moving-iron torque depends approximately on the square of current, so its direction is independent of current polarity and it can measure AC or DC.
Reference: Standard measurements and instrumentation: analog instruments
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