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

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Electrical Machines
With the increase in speed of DC motor

 Back emf falls and line current increase.
  Back emf increase but line current falls.
 Both back emf as well as line current increase.
 Both back emf as well as line current fall.

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

  reduction in field current, effect of armature reaction, armature.
  armature resistance, effect of armature reaction.
 armature resistance, inter poles, armature.
 armature resistance, effect of armature reaction.

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