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Electrical Machines

Electrical Machines
In DC machines internal characteristics are plotted between

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

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 some what less than 230 V
 not possible
 230 V

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Cummulative compound.
 Series.
 Differential compound.
  Shunt.

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Electrical Machines
Commonly used starters of cage motor is

None of these
  star delta.
  DOL.
  both A and B.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 1
 2
 8

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  vibrations.
  any of these.
  over excitation.

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MORE MCQ ON Electrical Machines

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