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Transformers

Transformers
Which of the following is not a fitting on a transformer?

Commutator
Buchholz's relay
Conservator
Breather

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Transformers
Which of the following parts of a transformer is visible from outside?

Bushings
Core
Secondary winding
Primary winding

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Transformers
A Buchholz relay can be installed on

Auto transformer
Air-cooled transformer
Oil cooled transformer
Welding transformer

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Transformers
For the parallel operation of single phase transformers it is necessary that they should have

same efficiency
same number of turns on the secondary side.
same kVA rating
same polarity

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Transformers
The principle of working of transformer is

Self induction
Static induction
Mutual induction
Dynamic induction

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Transformers
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

900 V
90 V
9 V
0.9 V

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