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

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

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

 Both A and R are true and R is correct explanation of A.
 A is ture and R is false.
 Both A and R are true and R is not correct explanation of A.
 A is false and R is ture.

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