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Transformers

Transformers
Which of the following transformer is smallest?

2kVA, 200 Hz
2kVA, 500 Hz
2kVA, 50 Hz
2kVA, 400 Hz

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Transformers
Transformer having ratings less than 5kVA are generally ______

None of the listed here
Natural air cooled
Water cooled
Oil cooled

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Transformers
An isolation transformer has primary to secondady turns ratio of

1:1
2:1
Can be any ratio
1:2

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Transformers
The turns ratio required to match an 80 source to a 320 load is

2
20
80
4

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

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

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Transformers
In a transformer, leakage flux

Helps in transfer of energy
Is negligible at full load
Produces mutually induced emf
Is minimised by interleaving the primary and secondary windings

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