Measurement and Instrumentation
To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken

From the same source as the unknown voltage
Any of the above
From a battery
From a source which is not the same as the unknown voltage

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

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

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