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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 50 Ω
 10 Ω
 100 Ω

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Electrical Machines
In synchronous motor the torque is proportional to

 1/P²
 P²
 Power P
 1/P

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 not changed
 decrease
None of these

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
  2.73 KW.
 5.46 KW.
 1.644 KW.

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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
 1, 2, 3, 4
 1, 3, 5
 2, 3, 4

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Electrical Machines
During no load test, an induction motor draws power

  for core loss and copper loss.
  only for the small copper loss.
  for core loss and windage and friction loss.
  for copper loss and windage friction loss.

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MORE MCQ ON Electrical Machines

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