engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Heat Treatment

______ ପ୍ରକ୍ରିୟା ଦ୍ୱାରା ହାଲୁକା ଇସ୍ପାତ ଉପରେ ଆବରଣ କଠୋରୀକରଣ କରାଯାଏ । 

1
ସାମାନ୍ୟିକରଣ
2
କଠୋରୀକରଣ
3
ତାପାନୁଶୀତନ 
4
ନାଇଟ୍ରାଇଡିଂ
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