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

 Remains unchanged.
 Decreases.
 None of above.
  Increases.

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Electrical Machines
Where the shunt generators are widely used?

 Where the load is very high.
 Where voltage variation is needed over a wide load range.
 Where often load fluctuation is occurred.
  Where a constant voltage is required over a narrow load range.

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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

 the interpoles produce additional flux to augment the developed torque
 the flux waveform is improved with reduction in harmonics
 a counter-emf is induced in the coil undergoing commutation
 the inequality of air-gap flux on the top and bottom halves of the armature is removed

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