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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

  1.
 0.3.
  0.54.
 0.7.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
 synchronizing power co efficient.
 mechanical rotatory system.
  restoring torque.

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Electrical Machines
Ward Leonard control provides speed control

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

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 36°
 72°
 18°

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 two winding transformer with secondary short circuited.
None of these
 auto transformer.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.05.
  1.0.
  0.1.

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MORE MCQ ON Electrical Machines

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