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