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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ V
 T ∝ 1/V²
 T ∝ 1/V

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Electrical Machines
The functions of inter poles are

None of these
 both 1 and 2
 nullify reactance voltage and improve the commutation.
 reduce cross magnetization effect and improve commutation

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Electrical Machines
Series booster is a

 shunt wound DC generator.
  series wound DC generator.
 separately excited DC generator.
 permanent magnet DC generator.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Squirrel cage IM.
  Double cage motor.
  Synchronous motor.
  Slip ring IM.

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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
 240 V
 6 V
 474 V

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure inductive load
 pure capacitive load
None of these
 pure resistive load

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