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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 1/V
 V²
 1/V²

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in normal operation.
  It will rotates in reverse direction.
  Either short circuit or open circuit occurs.
  Fail to start.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only field terminals are changed.
  only armature terminals are reversed.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 660
 40
 600

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with main poles
 series with armature
 parallel with armature
 parallel with main poles

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 None of these.
 Full load torque.
  Full load current.
 Full load speed.

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MORE MCQ ON Electrical Machines

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