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Transformers

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

250 kVA
500 kVA
3000 kVA
1000 kVA

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Transformers
The mutual flux in a transformer remains constant at all loads because ______

Leakage flux is small
Applied voltage and frequency are constant
Losses are small
Iron core is used

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Transformers
An open-circuit test on a transformer is conducted primarily to measure

insulation resistance
core loss
total loss
copper loss

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Transformers
The noise produced by a transformer is termed as

buzz
ringing
hum
zoom

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Transformers
The open circuit test on a transformer is always made on ______

Low voltage winding
Either low or high voltage winding
None of the listed here
High voltage winding

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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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