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TRANSFORMERS

Transformers
The primary leakage flux links _____

Both primary and secondary windings
Secondary winding only
Primary winding only
None of the listed here

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Transformers
A transformer operates poorly at very low frequencies because _____

None of the listed here
Magnetising current is abnormally high
Permeability of core is increased
Primary reactance is too much increased

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Transformers
If a power transformer is operated at very high frequencies, then ______

Primary will draw large power
Primary reactance is too much increased
None of the listed here
Core losses will be excessive

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Transformers
Leakage flux in a transformer occurs because

Applied voltage is sinusoidal
Transformer is not an efficient device
Iron core has high permeability
Air is not a good magnetic insulator

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

Leakage reactance
Eddy current loss
Iron losses
Copper loss

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