Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the armature current will reduce.
 the motor will come to stop.
 the motor will attain dangerously high speed.

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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

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

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