Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Slip ring induction motor.
  Stepper motor.
  DC differential compound motor.
  Synchronous motor.

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Electrical Machines
The speed of a DC series motor is

 Proportional to the armature current.
 Inversely proportional to the armature current.
 Proportional to field current.
 Proportional to the square of the armature current.

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