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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?

  0.05.
  0.905.
 1.1.
 20.

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

  coil resistance.
  reactance voltage induced in the coil.
 armature emf.
None of these

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Electrical Machines
The commutator segments of DC machines are made up of

 copper alloy
 hard-drawn copper
 copper
 brass

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Electrical Machines
A series motor is efficiently suitable for

 low starting torque operation.
  high starting torque operation.
 none of these.
 constant speed operation.

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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.

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

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Electrical Machines
The armature of DC motor is laminated

 to reduce the hysteresis loss.
 to reduce the inductor.
 to reduce the mass.
 to reduce the eddy current loss.

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