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1. Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?
(A): Power can be measured by this method only for star connected loads
(B): When two wattmeters have equal readings power factor is 0.5.
(C): When power factor is 1, one of the wattmeters readings is zero
(D): When the two wattmeter read equal and opposite, p.f. is zero.
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