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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 2000 rpm
 1000 rpm
 500 rpm

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
 Shunt motor.
 Brushless DC motor.
  Series motor.

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

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

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Electrical Machines
Hysteresis loss is proportional to

 f2.
 f1.5.
 f3.
  f.

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

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

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 S
 1/S
 1-S
 2-S

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MORE MCQ ON Electrical Machines

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