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

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

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 both hysteresis loss(Ph) and eddy current loss(Pe) will increase
 Pe will increase but Ph will decrease
 Ph will decrease but Pe will remain same
 Ph will increase but Pe will decrease

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