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Electrical Machines

Electrical Machines
In alternator, the rotary part is

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

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 2000.
 0.
 1000.

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Electrical Machines
An IM cannot run at synchronous speed because

  rotor torque will not be produced.
  air friction will prevent it.
  none of above.
  induction motor will become synchronous motor.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 1.
 2.
 4.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 0o.
 Greater than 90o.
 90o.
 less than 90o.

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

 Reduced copper loss.
 Reduced iron loss.
 Increase in weight/KVA.
  Decrease in weight/KVA.

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