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

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

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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

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

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