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Transformers

Transformers
Noise level test in a transformer is a

type test
routine test
special test
None of these

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Transformers
Leakage flux in a transformer occurs because

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

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Transformers
Harmonics in transformer result in

increased core losses
magnetic interference with communication circuits
increased I2R losses
All of the listed here

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Transformers
Distribution transformers are generally designed for maximum efficiency around

50% load
90% load
Zero load
25% load

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Transformers
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

2.5 W
25 W
250 W
0 W

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Transformers
In a transformer the energy is conveyed from primary to secondary

None of these
through cooling coil
by the flux
through air

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