Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as wide as possible.
  depends on the material of stator and the rotor.
  as small as possible.
  air gap does not matter.

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Electrical Machines
In a transformer

 OC test is conducted on HV side and SC test is conducted on LV side
 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

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