Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 rating of generators should be same.
 terminal voltage should be same.
 polarities should be same.
 both A and B.

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Electrical Machines
In a transformer

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

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