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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
 6.
  2.
  8.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high speed.
  magnetic inertia.
  residual flux.
  high field resistance.

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Electrical Machines
Which motor used in Lathe machine?

None of these
  D.C. cumulative compound motor.
  D.C . series motor.
  D.C. shunt motor.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.
 I1 = KI2 + Iμ.
 I1 = KI2 + Iw.

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

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

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Electrical Machines
A DC compound motor has

 only series field winding.
 tertiary winding.
 only shunt field winding.
 both shunt and series field winding.

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