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Transformers

Transformers
The dielectric strength of transformer oil is expected to be

33 kV
100 kV
lkV
330 kV

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Transformers
If a transformer core has air gaps, then, _________

Magnetising current is greatly increased
Reluctance of magnetic path is decreased
Eddy current is increased
Hysteresis loss is decreased

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Transformers
What is the approximate efficiency of large transformers?

65%
85%
95 %
75%

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Transformers
The maximum flux produced in the core of a transformer is ______

Directly proportional to supply frequency
Inversely proportional to primary voltage
None of the listed here
Inversely proportional to supply frequency

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Transformers
Harmonics in transformer result in

increased core losses
increased I2R losses
All of the listed here
magnetic interference with communication circuits

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Transformers
By laminating the core of a transformer, we decrease _____

Eddy current loss
Hysteresis loss
Copper loss
Leakage reactance

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