Choose the correct statement regarding two watt-meter method for power measurements in 3-phase circuit.

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answerhappygod
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Choose the correct statement regarding two watt-meter method for power measurements in 3-phase circuit.

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a) When power factor is unity, one of the wattmeters reads zero
b) When the readings of the two watt-meters are equal but opposite sign, the power factor is zero
c) Power can be measured using two watt-meter method only for star connected 3-phase circuit
d) When two watt-meters show identical readings, the power factor is 0.5
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