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200+ Free NC CDL Combination Vehicles Practice Questions

Pass your North Carolina CDL Combination Vehicles Test exam on the first try — instant access, no signup required.

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When checking trailer brakes during a roadside inspection, the brake adjustment is measured by:

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2026 Statistics

Key Facts: NC CDL Combination Vehicles Exam

80%

Minimum CDL knowledge-test score under 49 CFR 383.135

49 CFR 383.135

26,001 lb GCWR

North Carolina Commercial Class A threshold when towing over 10,000 lb GVWR

NCDMV Commercial Driver License page

180 days

North Carolina commercial learner permit validity before one allowed renewal

NCDMV Commercial Driver License page

14 days

Minimum CLP holding period before the North Carolina CDL skills test

NCDMV Commercial Driver License page

North Carolina Class A CDL applicants need the combination vehicles knowledge test because NCDMV defines Commercial Class A as combinations with GCWR of 26,001 pounds or more when the towed vehicle or vehicles exceed 10,000 pounds GVWR. The N.C. CDL Manual requires the combination vehicles test for drivers who want to drive combination vehicles. FMCSA and 49 CFR 383.135 require at least 80 percent on each CDL knowledge test, and failing the combination vehicle portion prevents issuance of a Group A CLP or CDL. Study coupling and uncoupling, fifth wheel and kingpin inspection, landing gear, glad hands, trailer brakes, ABS, off-tracking, rollover, backing, trailer skids, and jackknife prevention.

Sample NC CDL Combination Vehicles Practice Questions

Try these sample questions to test your NC CDL Combination Vehicles exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1For the North Carolina Class A CDL combination vehicles test, what is a combination vehicle?
A.A straight truck with cargo loaded in the bed
B.A truck or tractor pulling one or more trailers
C.Any commercial vehicle with a GVWR over 10,000 lb
D.A vehicle with both gasoline and diesel engines
Explanation: For CDL testing, a combination vehicle is a truck or tractor pulling one or more trailers. NCDMV uses the federal Class A/Group A framework for combinations, including tractor-semitrailers and other truck-trailer combinations.
2For combination-vehicle safety, which of the following is the most common combination vehicle on U.S. highways?
A.Tractor with a full trailer
B.Tractor-semi-trailer
C.Tractor pulling three trailers
D.Straight truck with a converter dolly
Explanation: The tractor-semi-trailer is the most common combination vehicle on U.S. highways. It consists of a tractor with a fifth wheel and a semi-trailer whose front end rests on the fifth wheel and is secured by the kingpin.
3What does GCWR stand for?
A.Gross Cargo Weight Rating
B.Gross Combination Weight Rating
C.General Combined Weight Reference
D.Government Commercial Weight Regulation
Explanation: GCWR is the Gross Combination Weight Rating - the total weight of the tractor plus trailer(s) plus cargo, fuel, and driver. A Class A CDL is required when GCWR is 26,001 lb or more and the towed unit has a GVWR over 10,000 lb.
4Under North Carolina and FMCSA CDL class rules, a Class A combination generally has GCWR of at least 26,001 pounds and a towed unit with GVWR over:
A.5,000 lb
B.8,000 lb
C.10,000 lb
D.12,000 lb
Explanation: NCDMV lists Class A/combination operation using the federal threshold: GCWR of 26,001 pounds or more when the vehicle being towed has a GVWR over 10,000 pounds.
5On the North Carolina CDL combination test, what is off-tracking?
A.The trailer drifting sideways on a wet road
B.The rear wheels of the trailer following a tighter path than the tractor's front wheels in a turn
C.Loss of tire traction during heavy braking
D.The vehicle leaving its travel lane on a curve
Explanation: Off-tracking is the phenomenon where the rear wheels of the trailer follow a shorter, tighter path than the tractor's steer axle through a turn. Drivers must compensate by swinging wider so the trailer's rear wheels clear curbs and other objects.
6On a North Carolina CDL road scenario, you are making a right turn in a tractor-semi-trailer at a city intersection. Because of off-tracking, you should:
A.Turn the wheel as soon as the cab clears the curb
B.Drive farther into the intersection so the trailer's rear wheels clear the curb
C.Make the turn as tightly as possible to stay in your lane
D.Slow down and use the trailer hand valve to stabilize
Explanation: Because the trailer's rear wheels track inside the tractor's path, you must drive farther into the intersection before turning so the trailer's rear wheels do not climb the curb or strike pedestrians and signs. Watch for overhead clearance and keep an eye on the right mirror.
7For a North Carolina CDL combination vehicle, when making a left turn in a combination vehicle, you should:
A.Make the tightest left turn possible to clear faster
B.Start in the right-most lane available
C.Watch for vehicles passing on your left in the lane next to you
D.Use the trailer hand valve halfway through the turn
Explanation: When turning left in a combination vehicle, watch for vehicles or motorcycles that may try to pass on your left in the adjacent lane. Stay in the right turn lane long enough so other drivers do not mistakenly try to squeeze past on your left side.
8Compared to a straight truck, a combination vehicle's steering response is:
A.Faster and more direct
B.Delayed and requires smaller, earlier corrections
C.Identical
D.Only affected by trailer length, not response time
Explanation: In a combination vehicle the trailer effectively pushes the tractor in turns, so steering response is delayed. Drivers must make smaller, earlier corrections. Over-steering can produce a trailer swing or jackknife.
9On the North Carolina CDL combination test, what is a jackknife?
A.A loose connection between the kingpin and fifth wheel
B.The tractor and trailer fold against each other at the coupling
C.A type of converter dolly used with doubles
D.A skid in which all four trailer tires lose traction simultaneously
Explanation: A jackknife occurs when the tractor and trailer fold against each other at the coupling, usually because the tractor's drive wheels lock under braking on slick pavement, causing the trailer to push the rear of the tractor sideways.
10If you start to feel the trailer skidding and swinging out behind you, what is the correct response?
A.Apply the trailer hand valve to slow the trailer
B.Steer in the same direction as the trailer is swinging
C.Get off the brakes so the trailer wheels can roll and the trailer can return inline
D.Use the parking brake to lock the trailer in place
Explanation: A trailer skid is almost always caused by locked trailer brakes. The cure is to release the brakes so the wheels can roll again, which lets the trailer return inline. Continuing to brake - or applying only the trailer hand valve - makes it worse.

About the NC CDL Combination Vehicles Exam

The North Carolina CDL Combination Vehicles Test is the knowledge test required for applicants who want to operate Class A tractor-trailers and other combination vehicles. N.C. CDL Manual Section 6 covers safe combination driving, rollover risk, rearward amplification, following distance, brake timing, railroad crossings, trailer skids, off-tracking, backing, trailer air and electrical lines, glad hands, tractor protection valve, trailer air supply, ABS, coupling, uncoupling, fifth wheel and kingpin checks, landing gear, and combination vehicle inspection.

Assessment

Multiple-choice CDL knowledge test for North Carolina Class A/Group A combination vehicle applicants; content is based on the N.C. Commercial Driver License Manual Section 6 and FMCSA CDL standards for combination vehicles.

Time Limit

No separate official North Carolina Combination Vehicles knowledge-test time limit was found in the reviewed NCDMV sources.

Passing Score

80% minimum on CDL knowledge tests

Exam Fee

Varies by North Carolina commercial license, permit, endorsement, and transaction; see the official NCDMV Licenses & Fees page. (North Carolina Division of Motor Vehicles (NCDMV))

NC CDL Combination Vehicles Exam Content Outline

25%

Safe Combination Driving

Rollover risk, high and off-center loads, rearward amplification, smooth steering, following distance, brake timing, low-clearance railroad crossings, off-tracking, safe turns, backing, trailer skids, and jackknife recovery.

30%

Coupling and Uncoupling

Fifth wheel inspection, kingpin condition, trailer height, wheel chocks, direct tractor alignment, air-line connection, trailer brake check, tug test, visual lock inspection, landing gear, electrical cord, and uncoupling sequence.

25%

Trailer Air, Electrical, and Brake Systems

Trailer hand valve limits, tractor protection valve, red trailer air supply control, service and emergency lines, glad hands, crossed-line hazards, trailer tanks, shutoff valves, trailer service and emergency brake tests, and ABS limits.

20%

Combination Vehicle Inspection

Lower fifth wheel mounting and grease, no visible fifth wheel gap, jaws around kingpin shank, release arm and safety latch, upper fifth wheel and kingpin, sliding fifth wheel locks, air/electric line routing, landing gear, ABS lamp, and clearance for turns.

How to Pass the NC CDL Combination Vehicles Exam

What You Need to Know

  • Passing score: 80% minimum on CDL knowledge tests
  • Assessment: Multiple-choice CDL knowledge test for North Carolina Class A/Group A combination vehicle applicants; content is based on the N.C. Commercial Driver License Manual Section 6 and FMCSA CDL standards for combination vehicles.
  • Time limit: No separate official North Carolina Combination Vehicles knowledge-test time limit was found in the reviewed NCDMV sources.
  • Exam fee: Varies by North Carolina commercial license, permit, endorsement, and transaction; see the official NCDMV Licenses & Fees page.

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

NC CDL Combination Vehicles Study Tips from Top Performers

1Read N.C. CDL Manual Section 6 before drilling practice questions; most combination questions come directly from those procedures and warnings.
2Memorize coupling order: inspect fifth wheel, chock/secure trailer, align tractor, connect air lines, supply air, check trailer brakes, lock trailer brakes, back under, tug test, inspect coupling, connect electrical cord, raise landing gear, and remove chocks.
3For fifth wheel questions, focus on no visible gap, jaws around the kingpin shank, locked release arm, safety latch engaged, and sliding fifth wheel pins locked.
4For air-line questions, remember red emergency/supply, blue service/control, clean glad-hand seals, avoid crossed lines, and test trailer brakes before driving.
5For driving questions, slow before turns, allow long following distance, avoid quick lane changes, keep cargo low and centered, watch mirrors for trailer skids, and back slowly with pull-ups as needed.

Frequently Asked Questions

What score do I need to pass the North Carolina CDL Combination Vehicles Test?

49 CFR 383.135 requires at least 80% correct on CDL knowledge tests. The same rule says an applicant who fails the combination vehicle portion must not be issued a Group A CLP or CDL.

What does North Carolina Class A CDL cover?

NCDMV describes Commercial Class A as combinations with gross combination weight rating of 26,001 pounds or more when the vehicle or vehicles being towed have GVWR over 10,000 pounds.

What does the North Carolina combination test cover?

The N.C. CDL Manual Section 6 covers combination driving safety, rollover, off-tracking, backing, trailer skids, combination air systems, ABS, coupling and uncoupling, fifth wheel and kingpin inspection, landing gear, air/electric lines, trailer brake checks, and combination inspection.

Is doubles/triples included in this test?

Only basic overlap appears in combination-vehicle safety. NCDMV lists a separate T endorsement and a special knowledge examination for drivers who want to pull double or triple trailers.

How long is a North Carolina commercial learner permit valid?

NCDMV states that a commercial learner permit is valid for 180 days and is eligible for one renewal that is also valid for 180 days.

Do I need to hold a CLP before the North Carolina CDL skills test?

Yes. NCDMV states that after obtaining a commercial learner permit, you must hold it for at least 14 days before taking the CDL skills test.