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Transformers

Transformers
Natural oil cooling is used for transformers upto a rating of

1000 kVA
250 kVA
3000 kVA
500 kVA

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Transformers
The efficiencies of transformers compared with that of electric motors of the same power are

much smaller
much higher
somewhat smaller
about the same

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Transformers
A transformer transfers electrical energy from primary to secondary usually with a change in ______

Voltage
Time period
Power
Frequency

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Transformers
The iron core is used to ______of the transformer.

Increase the wight
Provide tight magnetic coupling
None of the listed here
Reduce core loss

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Transformers
The steel used for transformer core has

High silicon content
All of the listed here
Low hysteresis loss
High permeability

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

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

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