Electrical Machines Transformer

Which of the following is correct with reference to phasing out test on transformers? 

1
This test is carried out both on 1Φ and 3Φ transformers to identify high-voltage winding.
2
This test is carried out both on 1Φ and 3Φ transformers to identify the primary and secondary winding.
3
This test is carried out only on the 3Φ transformer to identify primary and secondary winding in the same phase.
4
This test is carried out only on 1Φ transformer to identify primary and secondary winding.

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