Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia remains constant but ωm increase
 both decrese
 Ia increases and ωm decreses
 both armature current Ia and speed ωm increase

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Electrical Machines
Slip speed is the

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

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