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Transformers

Transformers
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

8,800 V
880 V
88 V
8.8 V

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Transformers
Leakage flux in a transformer occurs because

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

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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

25 W
250 W
0 W
2.5 W

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Transformers
For the parallel operation of single phase transformers it is necessary that they should have

same number of turns on the secondary side.
same kVA rating
same polarity
same efficiency

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Transformers
The eddy current loss in a transformer is directly proportional to _______.

The flux density in the core
The supply frequency
Square of thickness of core lamination
Thickness of core lamination

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Transformers
A Buchholz relay can be installed on

Auto transformer
Air-cooled transformer
Oil cooled transformer
Welding transformer

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