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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 less than 50%.
 more.
 same.

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

 Copper loss
 Iron loss
All of these
 Rotational loss

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Electrical Machines
In DC machine yoke offers

 flux path completion
 produce working flux
 both A and B
 mechanical protection to the machine

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Electrical Machines
On what factors the speed of dc motor depends?

 Field flux.
 Applied voltage.
 Armature current Ia.
 All of these.

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Electrical Machines
Which of the following motor has more stability

None of these
 salient pole motor
 cylindrical motor
 both motors has same stability

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 just ahead of magnetic neutral axis.
 just behind the magnetic neutral axis.
None of these
 in magnetic neutral axis.

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