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

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

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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.

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

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