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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?

 1.1.
  0.905.
  0.05.
 20.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Any of above.
 Shunt field resistance control.
 Armature voltage control.

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 draw too much current.
 open fuse or circuit breaker.
 develop excessive speed and damage itself.
 produce sparking at brushes.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
 90°.
 0°.
  about 75°.

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It is cheaper in cost.
 It runs at very high speed at light load.
 It consume less power.

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Electrical Machines
Diverters are used only in

 series motors
 either of these
 shunt motors
None of these

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