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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 5.46 KW.
  2.73 KW.
 0.9103 KW.
 1.644 KW.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 1/2*ωm
 ωe = 4*ωm
 ωe = 2*ωm
 ωe = ωm

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

  1 - 2 µF.
 5 - 10 F.
 0.1 µF.
  2 - 3 µF.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -1.92
 0.08
 1.92
 -0.08

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
 Shunt motor.
  Series motor.
 Brushless DC motor.

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Electrical Machines
An IM cannot run at synchronous speed because

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

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