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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 1
 10
 100
 50

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 mechanical loss
 hysteresis loss
 eddy-current loss

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series motor.
 DC shunt generator.
 DC shunt motor.
  DC series generator.

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Electrical Machines
Torque developed in the rotor is

 not dependent on the slip
 directly proportional to slip
 inversely proportional to slip
 either of these

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Electrical Machines
Use of fractional pitch winding

  results in reduced leakage reactance.
  make it stiffer.
  results in reduced axial length of the machine.
All of these

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 same.
 changes.
 different.

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