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Transformers

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

Breather
Conservator
Buchholz's relay
Commutator

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

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Transformers
Transformer having ratings less than 5kVA are generally ______

Water cooled
Natural air cooled
None of the listed here
Oil cooled

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Transformers
If a transformer core has air gaps, then, _________

Hysteresis loss is decreased
Eddy current is increased
Reluctance of magnetic path is decreased
Magnetising current is greatly increased

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Transformers
The hum in a transformer is mainly attributed to

load changes
oil in the transformer
magnetostriction
mechanical vibrations

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Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

5
0.2
0.4
25

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