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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
100 W
200 W
50 W

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

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

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Transformers
In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

one-fourth the primary current
four times the primary current
one-fourth the primary current and equal to the primary current
equal to the primary current

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Transformers
Which of the following property is not necessarily desirable in the material for transformer core?

High permeability
Mechanical strength
High thermal conductivity
Low hysteresis loss

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

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

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Transformers
A common method of cooling a power transformer is

oil cooling
Any of these
air blast cooling
natural air cooling

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