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Transformers

Transformers
The dielectric strength of transformer oil is expected to be

100 kV
lkV
330 kV
33 kV

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Transformers
What is the approximate efficiency of large transformers?

65%
85%
75%
95 %

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

Equal to
None of the listed here
Less than
Higher than

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Transformers
Two things which are same for primary and secondary of transformer are ______

Currents and induced voltages
Resistance and leakage reactances
Ampere turns and voltage per turns
None of the listed here

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Transformers
Sumpner's test is conducted on transformers to determine

None of these
temperature
all-day efficiency
stray losses

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Transformers
Noise level test in a transformer is a

None of these
type test
routine test
special test

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