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Transformers

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

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

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Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

2,400 V
120 V
12 V
240 V

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Transformers
An isolation transformer has primary to secondady turns ratio of

1:2
1:1
2:1
Can be any ratio

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Transformers
Which winding of the transformer has less cross-sectional area?

High voltage winding
Low voltage winding
Primary winding
Secondary winding

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Transformers
When secondary of a current transformer is open-circuited its iron core will be

hot because of heavy iron losses taking place in it due to high flux density
hot because primary will carry heavy current
cool as there is no secondary current
none of above will happen

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Transformers
A transformer will work on

Dc only
None of the listed here
AC as well as DC
Ac only

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MORE MCQ ON Transformers

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