Power transformers are designed to have maximum efficiency at

A)
No-load
B)
60 % load
C)
80 % load
D)
Full load

Correct Answer : Option (D) :   Full load

Explanation : Power transformers are usually used for transmission purposes as a step-up device. Power transformers are not directly linked to the consumer side; therefore, it causes very less load fluctuation. So, the power transformer can operate on full load.

Recently Updated in Transformers Questions
Which of the following parts of a transformer is visible from outside?
A)
Core
B)
Bushings
C)
Primary winding
D)
Secondary winding

Correct Answer :   Bushings

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

Correct Answer :   magnetising current and loss

Natural oil cooling is used for transformers up to a rating of
A)
250 kVA
B)
500 kVA
C)
1000 kVA
D)
3000 kVA

Correct Answer :   3000 kVA

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