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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 six.
 three.
 four.
 two.

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Electrical Machines
Use of fractional pitch winding

  make it stiffer.
All of these
  results in reduced leakage reactance.
  results in reduced axial length of the machine.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque only.
  none.
  high power factor only.
  high staring torque and high power factor.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  s2.
  sf / 2.
  f / s.
  sf.

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Hydro alternators.
 Turbo alternators.
 Aame in both alternators.

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Closed slots.
  Open slots.
  Semi closed slots.
  None of above.

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MORE MCQ ON Electrical Machines

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