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.
 1.24.
 0.62.
 0.72.

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 decreases in generators and increases in motor with load.
 increases in both the generators and the motors with load.
  decreases in both generators and the motors with load.
 increases in generators but decreases in motor with load.

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