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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 cast iron.
 copper.
 mica.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/2 of the initial value
 twice the initial value
 4 time the initial value
 1/4 of the intial value

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  transformer with short-circuited secondary.
  repulsion motor type starting.
  synchronous motor.
  capacitor run IM.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  decreasing of frequency.
  increasing number of poles.
  speed can not be increased.
  increasing of frequency.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-excitation.
  Periodic variation of load.
  Over-loading for long period.
  Small and constant load.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  unequal to number of rotor slots and skewed in shape.
  equal to number of rotor slots.
  an integral multiple of number of rotor slots.
  either (B) or (C).

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MORE MCQ ON Electrical Machines

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