When a greater than normal amount of combustible mixture is ignited, the result may be:
a. A boiler explosion
b. A puff-back
c. A negative furnace pressure
d. A too rapid boiler warm-up
e. Liquid fuel entering the furnace
Answer: B
When a greater than normal amount of combustible mixture is ignited, the result may be:
a. A boiler explosion
b. A puff-back
c. A negative furnace pressure
d. A too rapid boiler warm-up
e. Liquid fuel entering the furnace
Answer: B