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Transformers

Transformers
Efficiency of a power transformer is of the order of

50 per cent
100 per cent
25 per cent
98 per cent

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Transformers
A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?

73 V
880 V
88 V
7.3 V

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Transformers
Natural oil cooling is used for transformers upto a rating of

1000 kVA
250 kVA
500 kVA
3000 kVA

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Transformers
The transformer that should never the secondary open circuited when primary is energised is _______

Current transformer
Power transformer
Auto transformer
Voltage transformer

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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
Thickness of core lamination
Square of thickness of core lamination

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Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

12 V
240 V
2,400 V
120 V

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