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Measurements and Instrumentation - Engineering

Q1:

In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative

A when power factor is less than 0.5 lagging

B when power factor is greater than 0.5 lagging

C when power factor is less than 0.5

D when power factor is unity

ANS:C - when power factor is less than 0.5

When p.f. is less than 0.5 (leading or lagging) one of the wattmeters reads negative.