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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 10°
 45°
 60°

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Slip ring IM.
  Squirrel cage IM.
  Single phase IM.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  any of the above.
  too rapid reversal of current.
 over commutation.
  under commutation.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 smoother acceleration.
 reduced starting current.
 more starting torque.
 more starting time.

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Electrical Machines
The three point starter is used for

  Shunt motor as well as compound motors.
  Shunt motor.
  Shunt, compound and series motor.
  Series motor.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to armature current.
  Constant.
 Proportional to the square of armature current.
 Inversely proportional to armature current.

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