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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.05.
  0.1.
  1.0.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  None of above.
  Open slots.
  Closed slots.

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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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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are connected.
 Armature winding is in series with load.
 Armature and field both are parallel.
  Armature and field both are in series with the load.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 2 ohm.
 100 ohm
 0.2 ohm
 10 ohm

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Electrical Machines
An IM cannot run at synchronous speed because

  none of above.
  air friction will prevent it.
  induction motor will become synchronous motor.
  rotor torque will not be produced.

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