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Electrical Machines

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

  0.1.
  1.0.
  0.5.
  0.05.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to achieve a stronger magnetic field.
 to avoid locking of the armature.
All of these
 to avoid over heating.

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Electrical Machines
In DC generators brushes are used for

 collecting of current without any sparkings
 reduce eddy current loss
 collecting of voltage
 convert ac armature current in to dc

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Electrical Machines
In shapers and slotters which motor are preferred?

  Slip ring IM.
  Synchronous motor.
  Double cage motor.
  Squirrel cage IM.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Increases.
 Decreases.
 Remain unchanged
 None of above.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 1000W
 500W
 3000W
 100W

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