Electrical Machines
Slip speed is the

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

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 field winding must be excited by low voltage dc supply
 the armature connection must be reversed
 the field winding connection must be reversed
 the field winding must be replaced

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