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Which of the following instruments are capable of serving as transfer instruments?
1. Moving Iron
2. Moving Coil
3. Electro dynamometer
4. None of the above

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Correct Answer - Option 3 : Electro dynamometer


Transfer instrument: An instrument which calibrated with a dc source and then used without modification to measure AC quantity. These instruments have the same accuracy for both dc and ac.


Precision type electrodynamometer (EMMC) is used in the standardization process of the potentiometer and hence It is a transfer instrument.

This instrument can be used as:

  • Ammeter
  • Voltmeter
  • Wattmeter
  • Reactive power meter (VAR meter)
  • Power factor meter
  • Frequency meter

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