Discussion :: Measurements and Instrumentation
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In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative
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A.
when power factor is less than 0.5 lagging
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B.
when power factor is greater than 0.5 lagging
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C.
when power factor is less than 0.5
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D.
when power factor is unity
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Answer : Option C
Explanation :
When p.f. is less than 0.5 (leading or lagging) one of the wattmeters reads negative.
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