Electronics and Communication Engineering - Measurements and Instrumentation - Discussion

Discussion Forum : Measurements and Instrumentation - Section 1 (Q.No. 42)

Measurements and Instrumentation

42.

Which of the following statement is correct for two wattmeters method of power measurement in 3 phase circuit?

Power can be measured by this method only for star connected loads

When two wattmeters have equal readings power factor is 0.5.

When power factor is 1, one of the wattmeters readings is zero

When the two wattmeter read equal and opposite, p.f. is zero.

Answer: Option

Explanation:

When p.f. is zero, active power is zero and the two redaings are equal and opposite.

Discussion:

1 comments Page 1 of 1.

Sajin said: 6 years ago

Please Explain.

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