Combination
All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Commercial Driver License Manual. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
Number of Question
Passing Score
8. When braking while pulling a trailer equipped with anti-lock brakes, you should:
Explanation
When driving a tractor-trailer combination that is equipped with an Anti-Lock Braking System (ABS), you should brake in the same manner that you would if the vehicle was not equipped with ABS.
9. When coupling:
Explanation
Incorrect coupling and uncoupling of combination vehicles can have extremely dangerous consequences.
10. A combination vehicle has ____ air line(s).
Explanation
Every combination vehicle has two air lines: the service line and the emergency line.
11. Combination vehicles:
Explanation
Driving combination vehicles requires more skill than driving single commercial vehicles. Combinations are generally longer, generally heavier, and are more vulnerable to rollover.
12. If your vehicle gets stuck on railroad tracks, you should:
Explanation
If your vehicle gets stuck on railroad tracks for any reason, you should immediately exit the vehicle and walk away from the tracks. Contact the proper emergency authorities.
13. To control surge when stopping, you should not:
Explanation
To reduce the risk of a surge in a tank vehicle, slow or stop while keeping a steady pressure on the brakes and do not release the brakes too early. Brake well in advance of a stop and increase your following distance.
14. Bobtail tractors are ____ to stop than tractors attached to full semitrailers.
Explanation
