Iron loss of a transformer can be measured by____________?
Correct answer: A. low power factor wattmeter
- A. low power factor wattmeter
- B. unity power factor wattmeter
- C. frequency meter
- D. any type of wattmeter
Explanation
In the open-circuit test, the wattmeter reading is mainly the iron loss, while the power factor is very low because the exciting current is largely reactive. Hence a low-power-factor wattmeter is used for accurate measurement.
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