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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
  1.5 to 2.
 3 to 5.
 2 to 3.

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Electrical Machines
For larger units high torque it is preferred to use

 DC shunt motor.
 Partial motor.
 Slip induction motor.
 Universal motor.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Normal.
 Very low.
 Very high.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  none of above.
  only armature terminals are reversed.
  only field terminals are changed.
  either field terminals are reversed or armature terminals are reversed.

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

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

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Electrical Machines
Which of the following is/are not a self starting motor?

 both 1 and 2
None of these
 3-phase induction motor
 1-phase induction motor

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MORE MCQ ON Electrical Machines

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