Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of rotor resistance.
  Change of number of pole.
  Change of supply voltage.
  Change of supply frequency.

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Electrical Machines
Where the shunt generators are widely used?

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

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 both power angle and power factor decrease
 power angle decrease and power factor increase
 both power angle and power factor increase
 power angle increase and power factor decrease

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