The full-load copper loss of a transformer is 1600 W. At half-load, the copper loss will be

A)
400 W
B)
800 W
C)
1600 W
D)
6400 W

Correct Answer : Option (A) :   400 W

Explanation : Copper losses are defined as I2*R losses many times, as they are directly proportional to the square of current flowing through them. Thus, copper losses will reduce if load is reduced that too in square proportion.

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Which of the following parts of a transformer is visible from outside?
A)
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B)
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C)
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D)
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Correct Answer :   Bushings

A no-load test is performed on a transformer to determine
A)
efficiency
B)
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C)
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D)
magnetising current and loss

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