Electrical Machines
Where the shunt generators are widely used?

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

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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Any of above.
 Inserting an additional resistance in the field circuit.
 Inserting an additional resistance in the armature circuit.
 Inserting resistance to armature circuit and field circuit.

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Electrical Machines
A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will

 not change and remain at 220 V
 increase to a value greater than 1.25 times 220 V
 increase to value lying between 220 V and 1.25 times 220 V
 increase to 1.25 times 220 V

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