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Electrical Machines

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

  4.
 16.
 32.
 8.

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Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 armature current (I)
 speed
 both A and B

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
  15 %.
  20 %.
 10 %.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 Compound Wound DC Motor
 Separately Excited DC Motor
 DC Series Motor

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Series shunt.
 have an equal number of electrons and protons.
 Cummulative compound.
  Differentical compound.

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

 Remains unchanged.
 None of above.
  Increases.
 Decreases.

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