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.
- 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
- A Engine knocking
- B Steering wander only
- C Pulling, sticking, or unusual feel as you apply the brakes
- D Smoke from the cab
- A Small trailer movement
- B No effect
- C Loss of brake pressure
- D Large trailer angle changes; small inputs are key
- A Octagonal, red, marked TRAILER AIR SUPPLY
- B Round, blue, marked TRACTOR
- C Square, white, marked CHARGE
- D Triangular, green, marked SERVICE
- A Hold the vehicle when parking
- B Apply trailer brakes momentarily
- C Test the trailer brakes
- D Both for parking and to prevent jackknife
- A Worn out tires
- B Driving too fast for conditions and/or too closely
- C Cargo movement
- D Engine failure
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- A Hydraulic brakes
- B Hand valves
- C A separate compressor
- D Sensors at each wheel that release brake pressure when wheel lockup is detected
- A Be missing
- B Be closed around the shank of the kingpin (not on the head)
- C Be open
- D Be loose
- A Released and visible after coupling
- B Locked and the safety latch in place after coupling
- C Tied with rope
- D Removed before driving
- A Hydraulic fluid
- B Fuel
- C Electrical power for trailer lights and ABS
- D Air for the brakes
- A All of the above
- B Cracks in the kingpin
- C Loose or missing fifth-wheel mounting bolts
- D Misalignment between tractor and 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
- A Lowered to the ground while driving
- B Fully raised before driving
- C Always halfway extended
- D Disconnected before driving
- A Cuts, abrasions, and worn seals
- B Engine oil leaks
- C Cargo placement
- D Loose lug nuts only
- A Only at the start of the day
- B Every 3 hours
- C Before, during, and after coupling
- D Only at the destination
- 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
- 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
- A Rust on the cab
- B Tire wear only
- C Engine damage
- D The trailer to come uncoupled
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.