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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

 2 / 3.
 5 / 6.
  4 / 5.
 6 / 7.

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Electrical Machines
Stray losses in transformer occurs in

 steel core.
 paper insulation in transformers.
 transformer insulating oil.
  winding conductors and steel structures of transformer.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
 decrease.
None of these
 either of these.

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Electrical Machines
A 3 - Φ slip ring motor has

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

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Electrical Machines
The crawling in the induction motor is caused by

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

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Electrical Machines
For larger units high torque it is preferred to use

 Universal motor.
 Slip induction motor.
 DC shunt motor.
 Partial motor.

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