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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 load angle.
 excitation.
 both 1 and 2.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
 In order to get saturated.
 In order to get more flux.
All of these

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

  zero.
 positive.
 negative.
 low.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 reduce hysteresis loss only.
 reduce both eddy current and hysteresis loss.
 increase the permeability.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 460 V
 115 V
 200 V
 230 V

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
All of these
 Copper loss
 Iron loss

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