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Electrical Machines

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

  sf / 2.
  s2.
  sf.
  f / s.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Reluctance motor.
  Universal motor.
  Slip ring induction motor.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 1
 50
 10
 100

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Electrical Machines
Exciting current of an induction motor is

  none of these.
  equal as power transformer.
  lesser than power transformer.
  higher than power transformer.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = 1.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = N1 / N2.

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 brass
 copper
 copper alloy

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