Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 decrease.
 become execessively high.
 increase.
 remain unaltered.

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

  armature resistance, effect of armature reaction.
 armature resistance, inter poles, armature.
 armature resistance, effect of armature reaction.
  reduction in field current, effect of armature reaction, armature.

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

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

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