Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Oscillate around the normal speed.
  Increase.
  Remain unaltered.
  Reduce.

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Electrical Machines
In synchronous generator, inverted V curve is drawn between

 field current on Y-axis and power factor on X-axis
 field current on X-axis and armature current on Y-axis
 field current on X-axis and power factor on Y-axis
 field current on Y-axis and armature current on X-axis

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