Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 as it carries large load current.
 to reduce the insulation of materials.
 to provide large flux.
 in order to reduce eddy current to provide large flux.

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Electrical Machines
The synchronous reactance( Xs) is the

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

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