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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 remain the same as the original
 changes to 0.5 times the original value
 changes to three times the original value
 changes to 1.5 times the original value

ANSWER DOWNLOAD EXAMIANS APP