railway RRB JE (CBT I + CBT II) Mock Test 2024 Fitter Joining Welding

मध्यम कार्बन इस्पात को किसके साथ वेल्ड करना उपयुक्त होगा?

1
केवल AC
2
AC अथवा DC
3
DCEN
4
DCEP
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