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Electrical Machines

Electrical Machines
DC machine windings are

None of these
 short pitched
 full pitched
 either of these

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 180o.
 0o.
 90o.
 dependent upon the load.

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Electrical Machines
Hunting in a synchronous cannot be due to

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

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

 armature reaction.
  permanent magnets.
None of these
  residual magnetism.

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

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

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 1.5KW
 2KW
 0.5Kw
 3KW

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MORE MCQ ON Electrical Machines

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