Measurement and Instrumentation
The measurement of a quantity

 none of these.
  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.
 is a comparison of an unknown quantity with another quantity.

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

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