Electrical Machines
Slip speed is the

  sum of synchronous and rotor speeds.
  difference of synchronous speed and actual rotor speed.
  half of the sum of synchronous and rotor speeds.
  difference of actual rotor speed and synchronous speed.

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Electrical Machines
The synchronous reactance( Xs) is the

 reactance due to leakage flux
 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

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