Measurement and Instrumentation
Which of the following instruments can be used to measure AC current only?

Moving iron voltmeter
Moving iron ammeter
Induction type ammeter
Permanent Magnet Type ammeter

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 The precision in measurment is independent of the type of the defector used.
  It is based on null balance technique.
 None of above.
 It is possible to standardize before a measurement is undertaken.

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