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Electrical Machines

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

 32.
 16.
 8.
  4.

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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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Electrical Machines
In DC generator, the electricity produced in armature is

None of these
  AC.
  armature is not present in DC generator.
  DC.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the mass.
 to reduce the inductor.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Terminal voltage is same
 Both 1and 2
 Frequency should be same
 Speed of alternators should be same

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 150 V.
 200 V.
 300 V.
  223.V.

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