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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Equal to 1.
  High.
  Same as full load.
  Low.

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Electrical Machines
Synchronous condensers are used to

 improve the power factor
 reduce hunting
All of these
 improve starting torque

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 15.30%.
 16.67%.
 14.28%.
 18.25%.

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Electrical Machines
Which type motors are preferred for lathes?

 Squirrel Cage induction motor.
 Either A or B.
 Synchronous motor.
 DC shunt motors.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 3/4.
 4/3.
 16/9.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very low speed.
 start haunting.
 burn.
 run at very high speed.

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MORE MCQ ON Electrical Machines

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