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

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Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

 Both 1 and 2 are false.
 1 is true but 2 is false.
 Both 1 and 2 are true.
  1 is false but 2 is true.

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