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Electrical Machines

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

 T ∝ V
 T ∝ 1/V²
 T∝ V²
 T ∝ 1/V

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 30 volts.
 10 volts.
 20 volts.
 40 volts.

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Electrical Machines
which of the following type of brush and their application is/are correct

All of these
 carbon brush → normal ratings
 copper graphite → low voltage high current density
 electro graphite → large ratings

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Electrical Machines
A compound motor has

  both shunt and series field winding.
  tertiary winding.
  only series field winding.
  only shunt field winding.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Field control.
 Ward-Leonard control.
 Multiple voltage control.
 Armature control.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  0.54.
  1.

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