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Electrical Machines

Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Capacitor run
 Resistance split phase
 Shaded pole

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on full load.
  the generator runs on overload.
  there is no load on the generator.
  the generator runs on designed speed.

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

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

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 3
 1/√3
 1/3

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and high reactance.
  low resistance and low reactance.
  high resistance and low reactance.
  low resistance and high reactance.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

 demagnetisation.
  cross-magnetisation.
  cross-magnetization as well as demagnetization.
  none of above.

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