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Electrical Machines

Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

  13 HP.
 15 HP.
  10 HP.
 14 HP.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 20%
 reduced by 10%
 increased by 20%
 increased by 10%

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  √Ia.
  Ia.
  1/Ia.
  Ia2.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 5
 2, 3, 4
 1, 3, 5
 1, 2, 3, 4

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

None of these
  Ball bearings.
  Cast iron bearings.
  Bush bearings.

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Electrical Machines
Armature reaction in dc motor results

  increase in speed.
  open circuit.
  short circuit.
  decrease in speed.

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MORE MCQ ON Electrical Machines

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