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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 18°
 36°
 72°

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Electrical Machines
Ward Leonard control provides speed control

 below rated speed.
 in both direction.
 in one direction only.
 above rated speed.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

 (1 / 15) times the synchronous speed.
  0.5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 5 times the synchronous speed.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

  Series.
 Shunt.
 Cummulative compound.
 Differentical compound.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

All of these
 lagging power factor
 leading power factor
 unity power factor

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction generator torque.
  DC motor torque.
  synchronous motor torque.
  induction motor torque.

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MORE MCQ ON Electrical Machines

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