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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

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

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Electrical Machines
Which of the DC Motor use flywheel?

 Shunt motor.
 Cumulatively compound motor.
 Differently compared motor.
 Series motor.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 30 W
 zero watt
 less than 30 W
 more than 30 W

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 8.
  4.
 16.
 32.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 zero or very low voltage supply.
 over load.
 high filed circuit resistance.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  residual flux.
  high speed.
  high field resistance.
  magnetic inertia.

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