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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  15 %.
  2.5 %.
 10 %.
  20 %.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  both of the above.
  hysteresis loss.
  eddy current loss.
  weight of the stator.

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

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

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  of low resistivity.
  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 can not be determined.
 266.20 N-m.
 133.22 N-m
 234.76 N-m.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 approach zero.
 aprroach infinity.
 between zero and infinity.
 remain unchanged.

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MORE MCQ ON Electrical Machines

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