When a flame retention head burner is used, the smoke level should be adjusted for _____.
a. zero smoke
b. No. 1 smoke
c. No. 1 to No. 2 smoke
d. No. 2 smoke
Question 2
While a boiler is in dry storage, the condition of the desiccant should be checked about every _____.
a. two weeks
b. six weeks
c. three months
d. six months