Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 shunt.
 cumulative compound.
 series.
 differential compound.

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Electrical Machines
The synchronous reactance( Xs) is the

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

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