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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmin to Imin.
 Vmax to Imin.
 Vmax to Imax.

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Electrical Machines
Which of the following statements are correct ?

 The leakage reactance of the induction motor should be small.
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.
None of these

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Armature.
 Yoke.
 Brush.
  Commutator.

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Shaded pole
 Capacitor start
 Capacitor run
 Resistance split phase

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

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 1/S
 2-S
 S
 1-S

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