Electrical Machines
Armature coil is short circuited by brushes when it lies

  in any of above positions.
  in none of above positions.
  along field axis.
  along neutral axis.

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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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