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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 2 to 3.
 1.0.
  1.5 to 2.
 3 to 5.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 increasing the number of turns.
 using transformer oil of better quality.
 using soft material for winding.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  induction motor torque.
  synchronous motor torque.
  induction generator torque.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at light loads only
 both A and B
 low at rated load only
 low at heavy loads only

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  provide return path for the flux.
  ventilate the armature.
  hold armature stamping in position.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature circuit resistance control.
 Armature voltage control.
 Any of above.
 Field resistance control.

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MORE MCQ ON Electrical Machines

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