An open-circuit test on a transformer is conducted primarily to measure______________?
Correct answer: C. core loss
- A. insulation resistance
- B. copper loss
- C. core loss
- D. total loss
- E. efficiency
- F. none of the above
Explanation
The open-circuit test is made at rated voltage with the secondary open, so the wattmeter reading mainly represents hysteresis and eddy-current losses in the core. Full-load copper loss cannot be obtained from this test.
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