Electrical Machines
In a transformer

 both Oc and SC tests are conducted on HV side
 both OC and SC tests are conducted on LV side
 OC test is conducted on LV side and SC test is conducted on HV side
 OC test is conducted on HV side and SC test is conducted on LV side

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Electrical Machines
Slip speed is the

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

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