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Electrical Machines

Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 either GNA or MNA
 MNA
 GNA
None of these

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
 boo.
 zoom.
  hum.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 1, 3 and 4.
  1, 2 and 3.
 2 and 4.
 2, 3 and 4.

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Electrical Machines
DC generator will not build up voltage

  if it has lost residual magnetism.
 due to wrong direction of rotation.
 any one of above.
 if field resistance is more than critical resistance.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

  Stepper motor.
 Hysteresis motor.
 Reluctance motor.
 Shaded pole motor.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  starting resistance in the starter.
None of these
  rotor at slip rings.
  stator phases of the motor.

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