Measurement and Instrumentation
In AC circuits, the connection of measuring instruments cause loading effect errors which may effect

 magnitude, phase and waveform of the quantity being measured.
 only phase of the quantity being measured.
 only the magnitude of the quantity being measured.
 both of above.

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

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