HomeEngineeringWhen filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron. 17297. When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron.By Admin / September 13, 2025 cementite free graphite ✅ The correct answer is option B.
1. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm². Leave a Comment / Basic Chemical Engineering MCQs, Chemical Engineering, Engineering / By Admin
2. Transformer cores are normally made from Leave a Comment / Basic Chemical Engineering MCQs, Chemical Engineering, Engineering / By Admin