Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will attain dangerously high speed
 armature current will drop
 motor will become slow.
 armature will oscillate about original speed as the mean speed

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Electrical Machines
The synchronous reactance( Xs) is the

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

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