$17.$ Which of the following is a heavy petroleum product?

a$)$ Gasoline

b$)$ Diesel

c$)$ Naphtha

d$)$ Butane

$18.$ The process of converting straight$-$chain hydrocarbons into cyclic or aromatic hydrocarbons is known as:

a$)$ Cracking

b$)$ Reforming

c$)$ Alkylation

d$)$ Isomerization

$19.$ Which of the following is a common application of lubricants?

a$)$ Cooking

b$)$ Fueling automobiles

c$)$ Reducing friction in machinery

d$)$ Illuminating lamps

$20.$ Which refining process is used to remove sulfur from petroleum products?

a$)$ Cracking

b$)$ Reforming

c$)$ Alkylation

d$)$ Hydrotreating