Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  Single phase induction motor.
  AC slip ring motor.
  Synchronous motor.

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Electrical Machines
In a star - delta starting of an IM

  line voltage is 57.7 % of stator voltage.
  applied voltage per stator phase is 57.7 % of a line volt
  reduced voltage is applied to the stator.
  resistance is inserted in the rotor.

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