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Transformers

Transformers
Power transformers are generally designed to have maximum efficiency around

no-load
10% overload
near full-load
half-load

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Transformers
In the short circuit test on a transformer, we generally short circuit ______

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

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Transformers
An ideal transformer is one which _______

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

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Transformers
If a transformer core has air gaps, then, _________

Eddy current is increased
Hysteresis loss is decreased
Reluctance of magnetic path is decreased
Magnetising current is greatly increased

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Transformers
The output current corresponding to the maximum efficiency for a transformer having core loss of 200 W and equivalent resistance referred to secondary of 0.5 Ω is

10 A
15 A
5 A
20 A

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Transformers
What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

0.96
4
0.4
9.6

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