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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Traction.
  Food mixer.
  Lift.
  Domestic pump.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 4
 1
 2
 6

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Electrical Machines
Dynamic braking is very effective for

 series motors.
 shunt motors.
 separately excited motors.
 differential compound motors.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-loading for long period.
  Small and constant load.
  Periodic variation of load.
  Over-excitation.

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Electrical Machines
Lap winding is prefered for which type of machines?

 low current and high voltage
 low current and low voltage
 high current and high voltage
 high current and low voltage

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetisation.
  none of above.
  cross-magnetization as well as demagnetization.
 demagnetisation.

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