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

 5.7 Ω
 1.9 Ω
 6 Ω
 2.2 Ω

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Electrical Machines
In an alternator, voltage drops occurs in

  armature resistance, leakage reactance, armature reaction and earth connection.
  armature resistance, leakage reactance and armature reaction.
  armature resistance only.
  armature resistance and leakage reactance.

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