Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.25.
 0.72.
 1.24.
 0.62.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

None of these
 compensate for the decrease in speed due to increase of load.
  neutralize voltage induced in coil due to fluctuation of l
 reduce eddy current losses by providing local short circuits.

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