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Arkansas Combination Vehicles CDL Practice Test

Below are 25 exam-style questions for the Arkansas Combination Vehicles CDL knowledge test, modeled on the FMCSA-aligned content used by the Arkansas Office of Driver Services. Try to answer each question on your own before reading the answer key directly under it. The questions and answer choices are shuffled deterministically per state and endorsement, so the order will stay the same on repeat visits — that lets you genuinely measure your improvement.

Heads up: this is a study tool, not a graded exam. Cover the answer with your hand or a sheet of paper for an honest practice run, then re-read the explanations for any questions you missed. Aim for 22 out of 25 or better, three times in a row, before scheduling the real exam.
Question 1 of 25
Before pulling the kingpin release lever to uncouple, you must:
  • A Honk the horn
  • B Lower the trailer landing gear and chock the trailer wheels
  • C Drain the air tanks
  • D Disconnect the electrical line first
Correct answer: B
Always lower the landing gear and chock the trailer so it cannot move once you pull out from under it.
Question 2 of 25
During a brake check before moving, you should look for:
  • A Engine knocking
  • B Steering wander only
  • C Pulling, sticking, or unusual feel as you apply the brakes
  • D Smoke from the cab
Correct answer: C
Low-speed brake test identifies pulling, sticking, or weakness so you don't discover it on the highway.
Question 3 of 25
When backing a trailer, small steering inputs cause:
  • A Small trailer movement
  • B No effect
  • C Loss of brake pressure
  • D Large trailer angle changes; small inputs are key
Correct answer: D
Trailer responds aggressively to small wheel inputs in reverse — back slowly and correct quickly.
Question 4 of 25
Trailer air supply valves on tractors are typically:
  • A Octagonal, red, marked TRAILER AIR SUPPLY
  • B Round, blue, marked TRACTOR
  • C Square, white, marked CHARGE
  • D Triangular, green, marked SERVICE
Correct answer: A
The trailer air-supply valve is the red, octagonal knob — a federal standard.
Question 5 of 25
The trailer hand valve should NOT be used to:
  • A Hold the vehicle when parking
  • B Apply trailer brakes momentarily
  • C Test the trailer brakes
  • D Both for parking and to prevent jackknife
Correct answer: D
Don't use it to park (it can leak off) or to prevent a jackknife (it locks the trailer wheels and worsens the skid).
Question 6 of 25
Most rear-end collisions caused by combination vehicles result from:
  • A Worn out tires
  • B Driving too fast for conditions and/or too closely
  • C Cargo movement
  • D Engine failure
Correct answer: B
Speed and following distance dominate the causes. Increase cushion and slow down.
Question 7 of 25
The crank handle on the landing gear should:
  • A Be locked at half-height
  • B Be in the low position when traveling
  • C Be removed
  • D Be in the stowed (high) position when traveling
Correct answer: D
Stow the crank up so it doesn't catch on something while traveling.
Question 8 of 25
After connecting the air lines, before pulling the tractor away, you must:
  • A Charge the trailer brakes by setting the trailer air supply control
  • B Drain the wet tank
  • C Drive away immediately
  • D Pump the brakes 10 times
Correct answer: A
After connecting, charge the trailer system and verify brake operation.
Question 9 of 25
Most tire problems on a combination vehicle:
  • A Show up only at high speed
  • B Can be detected during pre-trip inspection by visual and pressure checks
  • C Are caused by low fuel
  • D Need a mechanic to find
Correct answer: B
Visual and pressure checks catch most problems before they become roadside failures.
Question 10 of 25
The proper test of a good fifth-wheel coupling is:
  • A Tug the trailer with the trailer parking brakes set
  • B Look at the locking jaws only
  • C Listen for a click
  • D Honk the horn
Correct answer: A
After coupling and locking, gently pull forward against the locked trailer brakes to confirm engagement.
Question 11 of 25
The proper sequence for uncoupling is generally:
  • A Release fifth wheel first, then connect lines
  • B Lower landing gear, disconnect lines, release fifth wheel, pull tractor away
  • C Pull tractor away first, then disconnect lines
  • D No specific order is required
Correct answer: B
Lower the landing gear, chock the wheels, disconnect air and electrical lines and stow them, release the fifth wheel, then slowly pull the tractor forward.
Question 12 of 25
A converter dolly:
  • A Is used to convert a semitrailer into a full trailer for towing in combination
  • B Replaces the fifth wheel on the tractor
  • C Is part of the tractor
  • D Is used only when triple-towing
Correct answer: A
A converter dolly turns a semitrailer into a full trailer that can be coupled behind another trailer.
Question 13 of 25
The "emergency" line (supply line) on a tractor-trailer:
  • A Drains the wet tank
  • B Operates the parking brake only
  • C Carries electrical signals
  • D Sends supply air to the trailer reservoirs and controls the trailer emergency brakes
Correct answer: D
Loss of pressure on the emergency line causes the trailer's emergency brake to apply automatically.
Question 14 of 25
Trailer ABS uses:
  • A Hydraulic brakes
  • B Hand valves
  • C A separate compressor
  • D Sensors at each wheel that release brake pressure when wheel lockup is detected
Correct answer: D
Wheel-speed sensors trigger valves to release pressure when lockup is detected.
Question 15 of 25
After coupling, the locking jaws should:
  • A Be missing
  • B Be closed around the shank of the kingpin (not on the head)
  • C Be open
  • D Be loose
Correct answer: B
Visual check: jaws around the shank, not the head. A flashlight helps.
Question 16 of 25
The fifth-wheel locking lever should be:
  • A Released and visible after coupling
  • B Locked and the safety latch in place after coupling
  • C Tied with rope
  • D Removed before driving
Correct answer: B
After backing under, the locking jaws must close around the kingpin and the safety latch must be in place.
Question 17 of 25
The seven-pin connector on a tractor-trailer carries:
  • A Hydraulic fluid
  • B Fuel
  • C Electrical power for trailer lights and ABS
  • D Air for the brakes
Correct answer: C
The seven-pin (or older five-pin) is electrical, supplying lights, brake-light signal, and ABS.
Question 18 of 25
You should inspect a combination vehicle for:
  • A All of the above
  • B Cracks in the kingpin
  • C Loose or missing fifth-wheel mounting bolts
  • D Misalignment between tractor and trailer
Correct answer: A
All three are pre-trip combination-vehicle items.
Question 19 of 25
Which is true about coupling order to a trailer?
  • A Connect any line first; order doesn't matter
  • B Connect air emergency line first, then service line, then electrical (or per company policy) — verify with brake check
  • C Connect electrical first, then air
  • D Connect only air; electrical is optional
Correct answer: B
Specific orders vary by carrier, but the principle is to charge the trailer brakes before moving and to verify with a brake check.
Question 20 of 25
The trailer landing gear (dolly legs) should be:
  • A Lowered to the ground while driving
  • B Fully raised before driving
  • C Always halfway extended
  • D Disconnected before driving
Correct answer: B
Landing gear must be fully raised and the crank handle secured before moving the trailer.
Question 21 of 25
When inspecting the air lines between tractor and trailer, look for:
  • A Cuts, abrasions, and worn seals
  • B Engine oil leaks
  • C Cargo placement
  • D Loose lug nuts only
Correct answer: A
Air-line condition is a typical roadside inspection focus on combinations.
Question 22 of 25
Brake-system pressure should be checked:
  • A Only at the start of the day
  • B Every 3 hours
  • C Before, during, and after coupling
  • D Only at the destination
Correct answer: C
Pressure changes during coupling indicate connection problems early.
Question 23 of 25
Off-tracking means:
  • A Loss of traction
  • B Driving off the road
  • C The trailer wheels follow a tighter arc than the tractor wheels in a turn
  • D Sliding sideways
Correct answer: C
In a right turn, the trailer wheels cut the corner. To compensate, the tractor must swing wider.
Question 24 of 25
When backing a tractor-trailer, you should:
  • A Always back to the right
  • B Back as fast as practical
  • C Back without using mirrors
  • D Back to the left whenever possible because you can see better
Correct answer: D
Backing to the driver's side gives the best view of the trailer. Always GOAL — Get Out And Look — before and during.
Question 25 of 25
A worn or damaged fifth wheel can cause:
  • A Rust on the cab
  • B Tire wear only
  • C Engine damage
  • D The trailer to come uncoupled
Correct answer: D
Worn locking jaws or a cracked structure can fail and release the trailer in motion.

Study tips for the Arkansas Combination Vehicles exam

The Combination Vehicles portion of the Arkansas CDL exam is graded out of the bank of questions the Arkansas Office of Driver Services draws from each year. While the exact bank is not published, every question is sourced from the Combination Vehicles chapter of the Arkansas CDL handbook, which itself is derived from the FMCSA Model Commercial Driver's License Manual. That means studying our practice tests, reading the corresponding handbook chapter, and re-reading the parts you got wrong is genuinely the most efficient route to a first-time pass.

Most successful applicants follow a simple cycle: take the practice test cold, write down every question you missed, open the matching chapter of the official Arkansas handbook, re-read the section that contains the right answer, then re-take the practice test 24 to 48 hours later. The 24-hour delay matters — sleep is when your brain commits new information to long-term memory, and CDL knowledge questions reward that kind of consolidated learning rather than cramming.

Pay particular attention to questions that include qualifier words like always, never, only, primary, or most. CDL test writers love to flip the right answer with a single qualifier. When two answer choices look almost identical, pay attention to the verb (is it must, should, or may?) and to any numbers (14 days, 100 air miles, 8 hours, 70/8 split). On endorsement tests in particular, watch for trick framing where a true statement about a different endorsement is offered as the "correct" answer to a question that is actually about Combination Vehicles.

Test-day logistics matter too. Bring photo ID, your Social Security card or birth certificate, your medical examiner's certificate (DOT card), and proof of state residency if you haven't already submitted those documents. The Arkansas Office of Driver Services will not let you sit for the knowledge exam without your documentation, and most offices charge an additional fee for re-attempts. Arrive early — the wait at most CDL testing offices runs 30 to 60 minutes — and silence your phone before the exam begins.

Finally, keep your General Knowledge fundamentals sharp even when you're focused on the Combination Vehicles exam. Many states administer multiple knowledge tests in a single sitting, and questions on weight definitions (GVWR, GCWR, GAWR), stopping distance, and the pre-trip inspection routine show up across endorsements. If you're unsure on the basics, sit a fresh Arkansas General Knowledge practice test before scheduling the real exam.

Next steps

Missed more than four questions? Re-read the Combination Vehicles study guide and the matching chapter in the official Arkansas CDL handbook. Then come back and re-take the test. Once you can score 22 of 25 or higher on three runs in a row, you're in good shape to schedule the real exam at your local Arkansas Office of Driver Services office.

Already comfortable with this endorsement? Drill another: AR General Knowledge · AR Air Brakes · AR Hazardous Materials · AR Passenger · AR School Bus · AR Tank Vehicle · AR Doubles / Triples

New to the CDL process in Arkansas? Read How to apply for a CDL in Arkansas for the document checklist and step-by-step timeline.