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

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Measurement and Instrumentation
The measurement of a quantity

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

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Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to

 Obtaine large deflecting torque.
 Reduce the size of the meter.
 Minimize the effect of stray magnetic fields.
  Minimize the effect of temperature variation.

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