Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Reluctance motor.
  AC slip ring IM.
  DC series motor.
  Capacitor type induction motors.

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 3 times maximum value of flux due to any phase
 1/2 times maximum value of flux due to any phase
 3/2 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase

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