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TRANSFORMERS

Transformers
The primary leakage flux links _____

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

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Transformers
A transformer operates poorly at very low frequencies because _____

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

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

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

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Transformers
Leakage flux in a transformer occurs because

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

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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
Leakage reactance
Iron losses

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