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Transformers

Transformers
Natural air cooling is generally restricted for transformers up to

50 MVA
15 MVA
1.5 MVA
5 MVA

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Transformers
The secondary of a current transformer is always short-circuited under operating conditions because it

None of these
is safe to human beings
protects the primary circuit
avoids core saturation and high voltage induction

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Transformers
The temperature rise of transformer is directly proportional to _______

Apparent power
None of the listed here
Leakage reactance
Reactive power

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

None of the listed here
Electrically and magnetically
Electrically
Magnetically

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Transformers
Leakage flux in a transformer occurs because

Applied voltage is sinusoidal
Iron core has high permeability
Air is not a good magnetic insulator
Transformer is not an efficient device

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

Boo
Hum
Magnetostriction
Zoom

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