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Transformers

Transformers
Distribution transformers are generally designed for maximum efficiency around

Zero load
50% load
25% load
90% load

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Transformers
Leakage flux in a transformer occurs because

Air is not a good magnetic insulator
Iron core has high permeability
Transformer is not an efficient device
Applied voltage is sinusoidal

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Transformers
What is the approximate efficiency of large transformers?

65%
95 %
85%
75%

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Transformers
Transformer breaths in when

None of these
load on it increases
load remains constant
load on it decreases

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Transformers
The power efficiency of a lightning transformer is always ______its all day efficiency.

Less than
Higher than
Equal to
None of the listed here

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Transformers
The path of the magnetic flux in transformer should have

low resistance
high reluctance
low reactance
high resistance

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