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Transformers

Transformers
Which of the following is not a part of transformer installation?

Conservator
Breather
Exciter
Buchholz relay

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Transformers
The steel used for transformer core has

High permeability
All of the listed here
Low hysteresis loss
High silicon content

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Transformers
Which of the following transformer is smallest?

2kVA, 200 Hz
2kVA, 500 Hz
2kVA, 400 Hz
2kVA, 50 Hz

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

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

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Transformers
Efficiency of a power transformer is of the order of

98 per cent
25 per cent
100 per cent
50 per cent

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

Hum
Boo
Magnetostriction
Zoom

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