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Electrical Machines

Electrical Machines
If a DC motor is connected across the AC supply it will

 Run at lower speed.
  Burn.
 Not run.
 Run at normal speed.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 increase pull out torque
 improve starting torque
 reduce magnetising current and improve power factor
 decrease starting torque

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

  0.05.
  0.905.
 20.
 1.1.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia2
 1/Ia
 I/Ia2
 Ia

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 230 V.
 220 V.
 225 V.

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Compound.
  Shunt.
  None of them.
  Series.

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MORE MCQ ON Electrical Machines

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