A common method of cooling a power transformer is_______________?
A common method of cooling a power transformer is_______________?
A. natural air cooling
B. air blast cooling
C. oil cooling
D. any of the above
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Silicon steel used in lamination’s mainly reduces___________?
Silicon steel used in lamination’s mainly reduces___________?
A. hysteresis loss
B. eddy current losses
C. copper losses
D. all of the aboveHarmonics in transformer result in___________?
Harmonics in transformer result in___________?
A. increased core losses
B. increased I2R losses
C. magnetic interference with communication circuits
D. all of the aboveThe maximum efficiency of a distribution transformer is____________?
The maximum efficiency of a distribution transformer is____________?
A. at no load
B. at 50% full load
C. at 80% full load
D. at full loadA no-load test is performed on a transformer to determine_______________?
A no-load test is performed on a transformer to determine_______________?
A. core loss
B. copper loss
C. efficiency
D. magnetising current
E. magnetising current and lossThe path of a magnetic flux in a transformer should have______________?
The path of a magnetic flux in a transformer should have______________?A. high resistance
B. high reluctance
C. low resistance
D. low reluctanceThe secondary winding of which of the following transformers is always kept closed?
The secondary winding of which of the following transformers is always kept closed?
A. Step-up transformer
B. Step-down transformer
C. Potential transformer
D. Current transformer