Attempting to light a burner __________ may cause a furnace explosion.
a) from hot refractory
b) without preheating the fuel
c) without first cooling the fuel
d) without a pilot light
e) by pre-purging the furnace
Answer: A
Attempting to light a burner __________ may cause a furnace explosion.
a) from hot refractory
b) without preheating the fuel
c) without first cooling the fuel
d) without a pilot light
e) by pre-purging the furnace