If the percentage impedances of the two transformers working in parallel are different, then
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load
Answer: Option D
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
The function of conservator in a transformer is
A. to project against internal fault
B. to reduce copper as well as core losses
C. to cool the transformer oil
D. to take care of the expansion and contraction of transformer oil due to variation of temper-ature of sur-roundings
Which of the following is the most likely source of harmonics in a transformer?
A. poor insulation
B. Overload
C. loose connections
D. Core saturation
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