Measurement and Instrumentation
Assertion(A): A low power factor wattmeter has special constructional features to ensure accurate measurment. Reason(R): Extension of wattmeter range in DC circuit can be easily done by using current and potential transformer

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

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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.

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

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 change the quantity under measurement to an analogues signal.
 to perform non liner operation like clipping filtering, chopping and clamping.
 change the magnitude of the input signal while retaining its identity.
 to perform linear operation like addition and multiplication.

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