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Electrical Machines

Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 5 / 6.
  4 / 5.
 6 / 7.
 2 / 3.

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 2, 4
 1, 3
 1, 4
 2, 3

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  carbon.
  aluminium.
  phosphor bronze.

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Electrical Machines
Universal motors are used in

 cranes
 food processing
 traction
All of these

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction by slowly.
 it will run in opposite direction.
 it will run in same direction.
 motor will not run.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Shunt motor.
  Cumulative compound motor.
  Differential compound motor.
  Series motor.

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MORE MCQ ON Electrical Machines

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