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Electrical Machines

Electrical Machines
Slip exists in

  synchronous motor.
  induction motor.
  none of above.
  in both machines.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetization as well as demagnetization.
 demagnetisation.
  none of above.
  cross-magnetisation.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 variable loss
 constant loss
 both A and B
None of these

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = P/2*ωm
 ωe = P*ωm
 ωe = 2/P*ωm
 ωe = ωm

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 225 V.
 230 V.
 220 V.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 750 rpm
 3000 rpm
 1500 rpm

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