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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

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

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 None of the options.
  Series.
 Parallel.
 Compound.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 0
 3 or 4
 1

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Electrical Machines
Scott connections are used for

 any of the above.
 three phase to two phase transformation.
 single phase to three phase transformation.
 three phase to single phase transformation.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

All of these
 continuity supply is maintained
 Increase efficiency under light load conditions
 Increase in reliability

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
  line to ground fault.
 3 - phase fault.
 line to line fault.

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