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Transformers

Transformers
A transformer has 200 W as iron loss at full load. The iron loss at full load. The iron loss at half full load will be

400 W
50 W
200 W
100 W

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Transformers
Which of the following transformer should never have the secondary open circuited while the primary is energised?

Current transformer
Power transformer
Potential transformer
Auto transformer

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Transformers
A no-load test is performed on a transformer to determine

efficiency
magnetising current
core loss
magnetising current and loss
copper loss

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Transformers
What is the approximate efficiency of large transformers?

95 %
85%
75%
65%

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Transformers
The primary winding of a power transformer should always be

open
shorted
switched
fused

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Transformers
Material used for construction of transformer core is usually

Silicon steel
Aluminium
Wood
Copper

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