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

 0.72.
 0.25.
 1.24.
 0.62.

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Electrical Machines
Where the shunt generators are widely used?

 Where the load is very high.
  Where a constant voltage is required over a narrow load range.
 Where voltage variation is needed over a wide load range.
 Where often load fluctuation is occurred.

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