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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  get over heated.
  make noise.
  run normally.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.57 %.
 3.76%.
 4.76%.
 2.56 %.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Slip.
 Running torque.
 Line voltage.
 Rotor current.

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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 net voltage across the armature resistance at the time of plugging will be

 234 V
 6 V
 240 V
 474 V

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Electrical Machines
Damper winding is used to

 both 1 and 2.
 decrease the load current.
 suppress the hunting.
 increase the load current.

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Electrical Machines
Which of the following statements is/are correct ?

 Both A and B.
 Compensating winding will act under the pole.
 Inter pole winding will act in interpolar region.
None of these

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