Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of a dc machine.
 rotor of an synchronous machine.
 stator of a dc machine.
 stator of a induction machine.

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Electrical Machines
Slip speed is the

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

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