HomeEngineeringThe percentage O2 by Weight in atmospheric air is____________? 271. The percentage O2 by Weight in atmospheric air is____________?By Admin / September 7, 2025 A. 18% B. 23% C. 77% D. 79% ✅ 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