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

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Measurement and Instrumentation
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

 The bridge can not be balanced.
 The bridge is balanced for some specified value of frequency.
 The bridge can be balanced.
 The bridge is balanced for some specified value of R1, R2, R3.

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