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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

Concept:

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.

Explanation:

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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