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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
 2 + s.
  2 - s.
 1 - s.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  increases armature speed.
  reduces generator emf.
  reduces inter poles flux density.
  results in sparking trouble.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Remains unchanged.
  Increases.
 None of above.
 Decreases.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Open fuse or circuit breaker.
 Produce sparking at brushes.
  Develop excessive speed and damage itself.
 Draw too much current.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 either of these
 exactly opposite
None of these
 same

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

  Full load current.
 Full load torque.
 Full load speed.
 None of these.

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