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

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Transformers
When load on a transformer is decreased, ______loss is decreased

Hysteresis
Copper
Friction
Eddy current

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Transformers
Which of the following transformer is smallest?

2kVA, 50 Hz
2kVA, 200 Hz
2kVA, 500 Hz
2kVA, 400 Hz

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Transformers
In the short circuit test on a transformer, we generally short circuit ______

High voltage winding
None of the listed here
Low voltage winding
Either low or high voltage winding

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Transformers
Which type of winding is used in 3phase shell-type transformer?

Cylindrical type
Rectangular type
Circular type
Sandwich type

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Transformers
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

25 W
0 W
250 W
2.5 W

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