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Transformers

Transformers
Efficiency of a power transformer is of the order of

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

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Transformers
Sumpner's test is conducted on transformers to determine

stray losses
all-day efficiency
temperature
None of these

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Transformers
Material used for construction of transformer core is usually

Aluminium
Silicon steel
Copper
Wood

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Transformers
The no load primary current is about ______of full load primary current.

15-30%
3-5%
30-40%
Above 40%

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Transformers
What is the approximate efficiency of large transformers?

65%
85%
75%
95 %

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Transformers
Short circuit test on transformers is conducted to determine

core losses
eddy current losses
hysteresis losses
copper losses

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