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Electrical Machines

Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Eg vs load current
 Vt vs load current
 Eg vs Ia

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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?

  data provided is insufficient.
 6.
  2.
  4.

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
  Commutator.
 Armature.
 Yoke.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 rectangular
 co- sinusoidal
 flat-topped

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imax
 Vmax to Imin
 Vmin to Imin

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Electrical Machines
In electric locomotive which of the following motor are used ?

  DC series motor.
  Separately compound motor.
  Shunt motor.
  Synchronous motor.

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