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Electrical Machines

Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  slip.
  crawling.
  cogging.
  skewing.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

  Decrease.
 Remains same.
 Increase.
 None of these.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 increases with increase in the load torque.
 remains constant.
 decreases with increase in the load torque.
 decreases with decrease in the load torque.

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

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

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 lap winding
 wave winding
 closed winding
 open type winding

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1-S
 1/S
 1/(1-S)

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MORE MCQ ON Electrical Machines

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