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Transformers

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

500 kVA
3000 kVA
250 kVA
1000 kVA

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Transformers
The open circuit test on a transformer gives _______

Friction losses
Total losses
Iron losses
Copper losses

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Transformers
The temperature rise of transformer is directly proportional to _______

None of the listed here
Apparent power
Leakage reactance
Reactive power

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Transformers
When secondary of a current transformer is open-circuited its iron core will be

none of above will happen
cool as there is no secondary current
hot because of heavy iron losses taking place in it due to high flux density
hot because primary will carry heavy current

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Transformers
A Buchholz relay can be installed on

Oil cooled transformer
Air-cooled transformer
Welding transformer
Auto transformer

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Transformers
Open circuit test on transformers is conducted to determine

core losses
eddy current losses
hysteresis losses
copper losses

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