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

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 It is possible to standardize before a measurement is undertaken.
  It is based on null balance technique.
 The precision in measurment is independent of the type of the defector used.
 None of above.

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