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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 DC compound.
 Induction motor.
  DC series.

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 non-ferrous material.
 insulating material.
 conducting material.

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Both lap and wave winding
 Lap winding
 None of above
 Wave winding

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Electrical Machines
The crawling in the induction motor is caused by

 high loads
 improper design of stator laminations
 low voltage supply
 harmonics developed in the motor

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

  Increases.
 Remains unchanged.
 None of above.
 Decreases.

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
 100 ohm.
  0.5 ohm.
 50 ohm.

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MORE MCQ ON Electrical Machines

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