Primary air:
a. Is supplied in the combustion zone
b. Is the same as excess air
c. Is supplied with all types of burners
d. Is premixed with fuel before being admitted to the furnace
e. Enters the furnace before the fuel
Answer: D
Primary air:
a. Is supplied in the combustion zone
b. Is the same as excess air
c. Is supplied with all types of burners
d. Is premixed with fuel before being admitted to the furnace
e. Enters the furnace before the fuel
Answer: D