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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.05.
  0.905.
 1.1.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 zero
 more than 6 V
 6 V
 less than 6 V

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Electrical Machines
Hunting phenomenon is observed in which motor?

 Both A and C.
 Induction motor.
  Synchronous motor.
 DC motor.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 any of the above
 less than
 greater than

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Magnetization
 Cross magnetization
None of these
 Demagnetization

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

 rectangular.
 trapezoidal.
 sinusoidal.
  triangular.

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