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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 1/V²
 1/V
 V²

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

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

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Electrical Machines
The frame of an induction motor is made of

  aluminium.
  stainless steel.
  closed grained cast iron.
  silicon steel.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 synchronous generator.
 synchronous motor.
  induction generator.
 induction motor.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 any of above method.
 rheostatic control.
 Ward Leonard control.
 none of above.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 synchronous speed.
 any of the above.
 slip speed.

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MORE MCQ ON Electrical Machines

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