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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 20.
 1.1.
  0.05.

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Split phase IM.
  Capacitor start capacitor run IM.
  Capacitor start IM.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 180.
 45.
 30.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.95
 1.06
 0.96
 0.87

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 20 V
 40 V
 50 V
 zero

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Electrical Machines
DC generator will not build up voltage

  if it has lost residual magnetism.
 if field resistance is more than critical resistance.
 due to wrong direction of rotation.
 any one of above.

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