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Electronics and Communication Engineering - Measurements and Instrumentation - Discussion

Discussion Forum : Measurements and Instrumentation - Section 1 (Q.No. 48)
Measurements and Instrumentation
48.
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
Answer: Option
Explanation:

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

Discussion:
2 comments Page 1 of 1.
Om tamrakar said:   9 years ago
When p.f is unity then one of the wattmeters reads negative.
Abhi said:   8 years ago
When one of the wattmeter reading is negative then the power factor range from 0-0.5.
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