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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
  0.905.
 20.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  crossmagnetising.
  none of above.
  magnetising.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.6 Nm
 15.28 Nm
 Zero
 16.55 Nm

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Series motor.
  Shunt motor.

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Electrical Machines
Slot wedges in a dc machine is made up of

 silicon steel.
 fibre.
 cast iron.
 mild steel.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  results in sparking trouble.
  increases armature speed.
  reduces generator emf.
  reduces inter poles flux density.

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