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Transformers

Transformers
A transformer will work on

Ac only
None of the listed here
Dc only
AC as well as DC

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Transformers
The noise resulting from vibrations of laminations set by magnetic forces, is termed as

Magnetostriction
Boo
Zoom
Hum

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Transformers
The primary and secondary of a transformer are ______ coupled.

Magnetically
Electrically
None of the listed here
Electrically and magnetically

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Transformers
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is

less than one
approximately equal to one
None of these
great than one

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Transformers
The main reason for generation of harmonics in a transformer could be

mechanical vibrations
fluctuating load
poor insulation
saturation of core

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

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

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