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Transformers

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

Conservator
Buchholz's relay
Breather
Commutator

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Transformers
Natural oil cooling is used for transformers upto a rating of

250 kVA
500 kVA
3000 kVA
1000 kVA

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Transformers
In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be

Ns
(Ns-l)s
s.N.
(l-s)Ns

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Transformers
In a transformer the energy is conveyed from primary to secondary

through air
None of these
through cooling coil
by the flux

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

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

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Transformers
The hum in a transformer is mainly attributed to

oil in the transformer
magnetostriction
load changes
mechanical vibrations

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