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
For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging

Pressure coil of the wattmeter will become ineffective.
One of the wattmeters will read zero
One of the wattmeter connections will have to be reversed
Both give the same readings

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