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Transformers

Transformers
Noise level test in a transformer is a

special test
routine test
None of these
type test

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Transformers
A no-load test is performed on a transformer to determine

magnetising current and loss
core loss
magnetising current
efficiency
copper loss

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Transformers
Which of the following transformer should never have the secondary open circuited while the primary is energised?

Power transformer
Auto transformer
Potential transformer
Current transformer

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

Current efficiency
Power efficiency
Energy efficiency
None of the listed here

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

Copper loss
Iron losses
Eddy current loss
Leakage reactance

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Transformers
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

14.1 W
1,020 W
111.5 W
0 W

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