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Electrical Machines

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
 1/√3
 1/3
 3

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  flux per pole.
All of these
  frequency of waveform.
  number of turns in coil.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
None of these
 armature reaction.
  permanent magnets.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  increases upto a limit and then remains almost constant.
  decreases.
  remains constant.
 increases.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

  Electromagnets.
 Both B and C.
 Permanent magnets.
 None of the options.

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 76.91 V.
 86.91 V.
  66.91 V.
 56.91 V.

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