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Transformers

Transformers
A transformer will work on

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

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Transformers
A transformer does not posses ______changing property.

Impedance
Power
Voltage
Current

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Transformers
Which of the following insulating materials can withstand the highest temperature safely?

Mica
Glass fibre
Cellulose
Asbestos

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Transformers
The no load primary current is about ______of full load primary current.

15-30%
3-5%
Above 40%
30-40%

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Transformers
An ideal transformer is one which _______

Does not work
Has same number of primary and secondary turns
None of the listed here
Has no losses and leakage reactance

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

Eddy current loss
Leakage reactance
Copper loss
Iron losses

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