Electrical Machines
The basic function of a transformer is to change

 the frequency
 the power factor
 the level of the voltage
 the power level

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Electrical Machines
Slip speed is the

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

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