Furnace explosions may be caused by:
a. Inoperative low water fuel cut-offs
b. A very rich fuel-air mixture in the furnace
c. Scale accumulations on the boiler surfaces
d. Excessive furnace purging
e. Excessive furnace temperature
Answer: B
Furnace explosions may be caused by:
a. Inoperative low water fuel cut-offs
b. A very rich fuel-air mixture in the furnace
c. Scale accumulations on the boiler surfaces
d. Excessive furnace purging
e. Excessive furnace temperature