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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  short circuit.
  open circuit.
  increase in speed.
  decrease in speed.

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Electrical Machines
Hysteresis loss will depends on

 f
 f²
 f1.6
 f³

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  running the motor on leading power factors.
  oscillation cannot be damped.
  providing damper bars in the rotor pole faces.
  maintaining constant excitation.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.9 Ω
 31.1 Ω
 15.1 Ω
 31.9 Ω

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  none.
  always closed.
  semi closed or semi opened.
  always opened.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sinδ
 cos2δ
 sin2δ
 cosδ

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MORE MCQ ON Electrical Machines

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