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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC motor
 induction motor
 DC generator
 AC generator

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases
 remains constant.
 decreases.
 increases.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

  rate of change of flux is maximum.
 shaft rotation is high.
 rate of change of flux is minimum.
 induced voltage is high.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 8.
 16.
 32.
  4.

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Electrical Machines
Series generators are used in which of the following applications?

All of these
 Arc welding.
 Used as boosters in dc distribution or transmission.
 Air crafts.

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 infinity.
  unity.
 two.
 zero.

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