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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 V²
 1/V
 applied voltage V

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed falls.
 improve and the speed rises.
 deteriorate and the speed falls.
 deteriorate and the speed rises.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Mechanical power.
 Induced emf.
 Armature current.
 Can not be determined.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  crawling.
  resonance.
  cogging.
  harmonics.

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A resistor.
  None of these.
 A capacitor.
 an inductor.

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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.
  data provided is insufficient.
 6.
  2.

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