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

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

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Electrical Machines
The synchronous reactance( Xs) is the

 reactance either due to armature reaction or leakage flux
 reactance due to armature reaction of the machine
 combined reactance due to armature reaction and leakage flux
 reactance due to leakage flux

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 there was a break in the armature circuit
 field system lost residual magnetism
 field winding was wrongly connected
 field resistance was higher than critical resistance

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