Measurement and Instrumentation
The effect of load resistance is important in measurement of

 both A and B.
 resistance of shunt winding.
 resistance of shunt.
 resistance of ammeter.

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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

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

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