engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Fitter Joining Welding

थर्मिट प्रक्रिया द्वारा वेल्डिंग के बाद थर्मिट मोल्ड को ठंडा होने में कितना समय लगता है?

1
7 Hrs
2
9 Hrs
3
10 Hrs
4
12 Hrs
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