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Measurements and Instrumentation - Engineering

Q1:

In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is

A 1

B 0.5

C 0

D 0.8

ANS:B - 0.5

When p.f. = 0.5, 0 = 60° and one of the wattmeters reads zero.