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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 5%
 19%
 40%
 10%

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable frequency.
  variable load.
  windage friction.
  variable supply voltage.

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

 armature emf.
  reactance voltage induced in the coil.
  coil resistance.
None of these

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 18.18% increase
 36.36% increase
 36.36% increase
 36.36% decrease

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Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Copper loss
 Hysteresis loss
 Magnetic loss

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Electrical Machines
Which of the following motor used in hair dryers?

  Synchronous motors.
  Cage induction motor.
  Shaded pole IM.
  Split phase IM.

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MORE MCQ ON Electrical Machines

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