Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 6 Ω
 1.9 Ω
 2.2 Ω
 5.7 Ω

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

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