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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.
  4 / 5.
 5 / 6.
 6 / 7.

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Electrical Machines
Which type of motors uses slip rings?

 Both Synchronous and Induction motor
 DC Shunt Motor
 Synchronous motors
 Induction motors

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Electrical Machines
The reduced air gap results in an increase

  power factor.
  breaking torque.
  starting torque.
  cost of operation.

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Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
None of these
 reversing drive
 non reversing drive

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Electrical Machines
_____________ types of induction motor are widely used.

  Single phase IM.
  Squirrel cage IM.
  Three phase IM.
  Slip ring IM.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series generator.
 DC shunt motor.
 DC shunt generator.
  DC series motor.

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