Electrical Machines
Slip speed is the

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

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 both power angle and power factor decrease
 power angle decrease and power factor increase
 power angle increase and power factor decrease
 both power angle and power factor increase

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