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