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Electrical Machines

Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  16.67 Hz.
  60 Hz.
  50 Hz.
  25 Hz.

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Straight line through the origin.
 Straight line parallel to the speed axis.
 Circle about the origin.
 Rectangular hyperbola

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  over excitation.
  any of these.
  vibrations.

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

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 220 V
 more than 220 V
 6 V
 somewhat less than 220 V

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  DC series motor.
  Capacitor type induction motors.
  AC slip ring IM.
  Reluctance motor.

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MORE MCQ ON Electrical Machines

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