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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
The maximum flux produced in the core of a transformer is ______

Directly proportional to supply frequency
None of the listed here
Inversely proportional to primary voltage
Inversely proportional to supply frequency

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Transformers
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of

less than 15 A
more than 15 A
None of these
15 A

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Transformers
A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____.

400 W
100 W
200 W
None of the listed here

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Transformers
The amount of copper in the primary is _______that of secondary.

Greater than
About the same as
Smaller than
None of the listed here

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Transformers
The main reason for generation of harmonics in a transformer could be

mechanical vibrations
fluctuating load
poor insulation
saturation of core

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