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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 72°
 36°
 30°

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and armature current on Y-axis.
 either of these.
 field current on X-axis and power factor on Y-axis.
 field current on Y-axis and armature current on X-axis.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Eddy current losses
 Copper losses
 Both 1 and 2
 Hysteresis losses

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  4.
 6.
  data provided is insufficient.
  2.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will attain dangerously high speed
 armature current will drop
 motor will become slow.
 armature will oscillate about original speed as the mean speed

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Lap winding
 None of above
 Both lap and wave winding
 Wave winding

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