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Transformers

Transformers
Efficiency of a power transformer is of the order of

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

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Transformers
The all day efficiency of a transformer is ______ the commercial efficiency.

None of the listed here
More than
The same as
Less than

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Transformers
The all day efficiency of a transformer is also called its

Energy efficiency
None of the listed here
Current efficiency
Power efficiency

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Transformers
What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

4
9.6
0.4
0.96

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Transformers
In the short circuit test on a transformer, we generally short circuit ______

None of the listed here
Either low or high voltage winding
Low voltage winding
High voltage winding

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Transformers
The efficiencies of transformers compared with that of electric motors of the same power are

much higher
much smaller
somewhat smaller
about the same

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