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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

 10
 1
 50
 100

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 increase
 decrease.
 be unpredictable.
 remain the same.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
  induction generator.
 synchronous motor.
 synchronous generator.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 reactance voltage produced due to communication.
 the use drum winding.
 the use of compensating winding.
  the use equalizer in lap winding.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 speed regulation.
 efficiency.
 starting torque.
 running torque.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.
  Magnetic neutral axis.

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