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Transformers

Transformers
A transformer will work on

Ac only
Dc only
None of the listed here
AC as well as DC

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Transformers
The iron core is used to ______of the transformer.

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

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

Eddy current loss
Copper loss
Iron losses
Leakage reactance

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Transformers
Which of the following is the main advantage of an auto-transformer over a two winding transformer?

Hysteresis losses are reduced
Copper losses are negligible
Eddy losses are totally eliminated
Saving in winding material

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Transformers
The primary winding of a power transformer should always be

open
fused
shorted
switched

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

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

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