Electrical Machines
Slip speed is the

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

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field winding was wrongly connected
 field system lost residual magnetism
 there was a break in the armature circuit
 field resistance was higher than critical resistance

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