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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

  Synchronous motor.
 Both A and C.
 DC motor.
 Induction motor.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in normal operation.
  Either short circuit or open circuit occurs.
  It will rotates in reverse direction.
  Fail to start.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf.
  f / s.
  sf / 2.
  s2.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Shunt motor.
  Cumulative compound motor.
  Series motor.
  Differential compound motor.

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Electrical Machines
At slip s = 1 torque developed in machine is

  maximum torque.
  none.
  starting torque.
  electromagnetic torque.

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 74
 37
 72

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MORE MCQ ON Electrical Machines

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