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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 core.
 none of these.
  magnetic field poles.
 armature.

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Electrical Machines
Commutator in DC generator is used for

 collecting of current
 reduce losses
 increase efficiency
 convert AC armature current in to DC

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  air gap.
  cogging.
  relative speed.
  crawling.

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 mechanical loss
 copper loss
 both A and B

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 to earth.
 in reverse.
  to a DC source.
 to an AC source.

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Electrical Machines
The reduced air gap results in an increase

  cost of operation.
  breaking torque.
  power factor.
  starting torque.

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MORE MCQ ON Electrical Machines

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