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Transformers

Transformers
The dielectric strength of transformer oil is expected to be

lkV
33 kV
100 kV
330 kV

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Transformers
The open circuit test on a transformer is always made on ______

Low voltage winding
None of the listed here
High voltage winding
Either low or high voltage winding

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Transformers
The flux in the core of a single phase transformer is _____

None of the listed here
Purely alternating one
Partly alternating and partly rotating
Purely rotating one

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Transformers
In a transformer routine efficiency depends upon

Power factor of load
Both power factor and load current
Supply frequency
Load current

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Transformers
A Buchholz relay can be installed on

Oil cooled transformer
Welding transformer
Air-cooled transformer
Auto transformer

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Transformers
Noise level test in a transformer is a

routine test
special test
type test
None of these

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