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

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

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Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

 Both 1 and 2 are false.
 1 is true but 2 is false.
  1 is false but 2 is true.
 Both 1 and 2 are true.

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Measurement and Instrumentation
Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

 Both A and R are true and R is the correct explanation of A
 A is true but R is false
 Both A and R are true but R is NOT the correct explanation of A
 A is false bur R is true

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