Electrical Machines
Slip speed is the

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

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 both are of the same size for the same current rating
 A is bigger than B for the same voltage rating
 B is bigger than A for the same current rating
 A is bigger than B for the same current rating

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