Measurement and Instrumentation
The transfer instrument which is used for standardization of a polar type AC potentiometer is

 a thermal instrument.
 a dynamometer instrument.
 a moving coil instrument.
 an electrostatic instrument.

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Measurement and Instrumentation
The measurement of a quantity

  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.
 is a comparison of an unknown quantity with another quantity.
 none of these.

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