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

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

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

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

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