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Transformers

Transformers
Natural oil cooling is used for transformers up to a rating of

3000 kVA
250 kVA
500 kVA
1000 kVA

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Transformers
What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

16 kVA
4 kVA
8 kVA
0.25 kVA

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Transformers
A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____.

400 W
None of the listed here
200 W
100 W

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Transformers
Harmonics in transformer result in

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

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Transformers
Cores of large transformers are built upto nearly circular cross section in order to reduce

Copper loss
Iron losses
Eddy current loss
Leakage reactance

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Transformers
The primary leakage flux links _____

Primary winding only
Both primary and secondary windings
None of the listed here
Secondary winding only

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