Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 get damaged.
 develop very low starting torque.
 not start automatically.
 start automatically without trouble.

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

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