Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 10%
 increased by 20%
 reduced by 20%

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Electrical Machines
The synchronous reactance( Xs) is the

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

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