Electrical Machines
Which of the following motors has negative speed regulation?

 Shunt motors.
 Both B and C.
 Differential compound motors.
 Series motors.

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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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