District of Columbia CDL permit (CLP) knowledge tests — Practice

Question 1

A shut-off valve:

Accepted Answer

Prevents air from escaping an air brake system.

Question 2

Who is responsible for identifying the hazard class of materials being shipped?

Accepted Answer

The shipper

Question 3

When driving under wet conditions, what does a lack of spray from other vehicles indicate?

Accepted Answer

Ice has formed on the road.

Question 4

If a school bus needs to be evacuated, passengers should:

Accepted Answer

Use the exit deemed safest.

District of Columbia CDL permit (CLP) knowledge tests — practice