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Transformers

Transformers
The open circuit test on a transformer gives _______

Copper losses
Total losses
Iron losses
Friction losses

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

3000 kVA
500 kVA
1000 kVA
250 kVA

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Transformers
The all day efficiency of a transformer is also called its

None of the listed here
Power efficiency
Current efficiency
Energy efficiency

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Transformers
The voltage transformation ratio of a transformer is equal to the ratio of

primary turns to secondary turns
secondary induced e.m.f. to primary induced e.m.f.
secondary current to primary current
secondary terminal voltage to primary applied voltage

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Transformers
A Buchholz relay can be installed on

Oil cooled transformer
Auto transformer
Air-cooled transformer
Welding transformer

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Transformers
For the parallel operation of single phase transformers it is necessary that they should have

same polarity
same efficiency
same number of turns on the secondary side.
same kVA rating

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MORE MCQ ON Transformers

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