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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 2
 0 < S < 1
 -2 < S < 2
 -1 < S < 1

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

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

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Electrical Machines
which of the following type of brush and their application is/are correct

 copper graphite → low voltage high current density
 carbon brush → normal ratings
 electro graphite → large ratings
All of these

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
  8.
 6.
  2.

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Electrical Machines
The emf induced in the dc generator armature winding is

 AC and DC
None of these
 AC
 DC

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Mica.
  Glass.
  Vacuum.
  Oil impregnated paper.

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