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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 magnetization
 demagnetization
 cross magnetization

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 either of these.
 increase.
 decrease.
None of these

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
  1 - 2 µF.
 0.1 µF.
  2 - 3 µF.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Same in both induction motors.
 Squirrel cage induction motor.
None of these
 Slip ring induction motor.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  any of above methods.
  using a flywheel.
  providing damper winding in the rotor pole faces.
  designing the motor for adequate synchronizing power.

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Electrical Machines
Which of the following bearings and their uses are correct

 roller bearings → large machines
 both A and B
 neither 1 nor 2
 ball bearings → small machines

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MORE MCQ ON Electrical Machines

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