engineering recuitment PGCIL Junior Technician Trainee (Electrician) Mock Test 2023 Electrical Machines Transformer

निम्नलिखित में से कौन सा संयोजन 3 फेज 4 तार सेवा के लिए सबसे उपयुक्त है?

1
ΔΔ
2
YY
3
ΔY
4
YΔ
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