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Electrical Machines

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

 magnetostriction.
 zoom.
 boo.
  hum.

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Electrical Machines
A 3 - Φ slip ring motor has

  double cage rotor.
  wound rotor.
  any of the above.
  short-circuited rotor.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  high torque motor.
  single phase induction motor.
  high speed motor.

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Electrical Machines
Short circuiting is caused in the armature winding due to

  failure of insulation between two turns of coil.
 failure of insulation between two commutator bars.
  any of above.
  grounding of two or more turns of the same coil.

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Electrical Machines
If the excitation is reduced, the power factor is

None of these
 lagging power factor
 unity power factor
 leading power factor

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Inversely proportional to armature current.
 Proportional to the square of armature current.
  Constant.
 Proportional to armature current.

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MORE MCQ ON Electrical Machines

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