CDL Combination Vehicles Endorsement/Topics/Coupling

Coupling practice test: free CDL Combination Vehicles Endorsement questions

Coupling covers 15 questions in the QuizCram bank (15% of all questions), ranking as the second biggest domain for the CDL combination vehicles endorsement exam. Questions are written against the official Original practice questions on the combination vehicles endorsement, written from the federal knowledge requirements in 49 CFR Part 383 and the public CDL manual facts. The real test is a multiple-choice knowledge test, and you need 80% to pass. Try the 3 free sample questions below to test your understanding of these core rules.

Take the full timed quiz All CDL Combination Vehicles Endorsement questions
15%of the bank

15 questions, the second biggest topic. The ring is its size next to the biggest.

Try 3 sample Coupling questions

0 of 3 answeredTap an answer to check it

  1. Coupling1 of 3

    After coupling, how much space should there be between the upper and lower fifth wheel?

    The answer

    Answer: A. A gap means something is wrong. The kingpin may be on top of the closed jaws, and the trailer would come loose very easily. One inch, three inches or room for a hand would all show the jaws are not closed around the kingpin, so recouple instead of driving away.

    Source: 6.4.1 - Coupling Tractor-Semitrailers (Step 13)

  2. Coupling2 of 3

    Before you couple, how should the trailer be held in place?

    The answer

    Answer: D. A trailer that is not held could move when the tractor touches it. Chock the wheels, or be sure the trailer spring brakes are on. The tractor parking brake alone, a half-lowered landing gear or leaving the supply knob in do not stop the trailer from moving, so chocks or spring brakes are the safeguard.

    Source: 6.4.1 - Coupling Tractor-Semitrailers (Step 2)

  3. Coupling3 of 3

    How should you position the tractor when backing toward the trailer?

    The answer

    Answer: D. Backing under at an angle might push the trailer sideways and break the landing gear, so line the tractor up in front of the trailer first. Backing at an angle, beside the trailer or past its centreline all put the kingpin in the wrong place, and sideways pressure can damage the landing gear.

    Source: 6.4.1 - Coupling Tractor-Semitrailers (Step 3)

Quick answers on Coupling

QuizCram covers 15 practice questions in the Coupling domain, mapped directly to the official examination blueprint.

The benchmark score is 80% (Multiple-choice knowledge test · 80% to pass (49 CFR 383.135) · item count set by your state).

Yes. All questions on QuizCram are written against official handbooks and blueprint specifications with legal citations.