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

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

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Electrical Machines
Slip speed is the

  half of the sum of synchronous and rotor speeds.
  difference of actual rotor speed and synchronous speed.
  difference of synchronous speed and actual rotor speed.
  sum of synchronous and rotor speeds.

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 The accuracy in speed control is required.
 Very fine speed control over the whole range from zero to normal speed is required.
 All of above.
 The speed in both the direction is required.

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