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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
 1.1.
  0.05.
  0.905.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
  A - C - B.
 C - A - B.
 B - C - A.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 high initial cost.
 high maintenance cost.
 all of above.
 poor overall efficiency.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Differential compound motor
 Cumulative compound motors
 Shunt motor
 Series motor

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

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

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Electrical Machines
During hunting of a synchronous motor

  damper bar develops torque.
  negative phase sequence currents are generated.
  field excitation increases.
  harmonic are developed in the armature circuit.

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