Electrical Machines
A crusher is equipped with

 Reluctance motor.
 Slip ring induction motor.
 Synchronous motor.
 DC shunt motor.

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Electrical Machines
With the increase in speed of a DC motor

 back emf increases but line current falls.
 back emf falls and line current increases.
 both back emf as well as line current fall.
 both back emf as well as line current increase.

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  improve and terminal voltage will rise .
  worsen and terminal voltage will fall
 improve but terminal voltage will fall.
  worsen and terminal voltage will rise.

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