Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 solid connection.
 slip rings.
 none of above.
 commutator.

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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate with fall of terminal voltage.
 improve with fall of terminal voltage.
 improve with rise in terminal voltage.
 deteriorate with rise in terminal voltage.

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  not start at all.
  rotate in direction opposite to that before maintenance.
  rotate in the same direction as before maintenance.
  get heated and damaged.

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Electrical Machines
The synchronous reactance( Xs) is the

 reactance due to leakage flux
 combined reactance due to armature reaction and leakage flux
 reactance either due to armature reaction or leakage flux
 reactance due to armature reaction of the machine

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