A. Drain out water and sludge from the boiler during repair
B. Put off fire in the furnace when water level in the boiler falls to unsafe limit
C. Guard the boiler in case of abnormal rise in steam pressure
D. All A, B. & C
Correct Answer: Put off fire in the furnace when water level in the boiler falls to unsafe limit ✔
Last Updated: February 11, 2019