HomeEngineeringIf the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________? 399. If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?By Admin / September 7, 2025 A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen ✅ 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