West Virginia Combination Vehicles CDL Practice Test
Below are 25 exam-style questions for the West Virginia Combination Vehicles CDL knowledge test, modeled on the FMCSA-aligned content used by the West Virginia Division of Motor Vehicles. 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 Set both tractor and trailer parking brakes
- B Use the trailer hand valve
- C Set only the tractor parking brake
- D Leave the engine running with the brakes off
- A Released and visible after coupling
- B Tied with rope
- C Removed before driving
- D Locked and the safety latch in place after coupling
- A Loaded
- B Empty
- C Properly chocked
- D Too high — it can damage the kingpin or skip over the fifth wheel
- A Be removed
- B Be in the stowed (high) position when traveling
- C Be locked at half-height
- D Be in the low position when traveling
- A Connect electrical first, then air
- B Connect only air; electrical is optional
- C Connect air emergency line first, then service line, then electrical (or per company policy) — verify with brake check
- D Connect any line first; order doesn't matter
- A Round, blue, marked TRACTOR
- B Triangular, green, marked SERVICE
- C Square, white, marked CHARGE
- D Octagonal, red, marked TRAILER AIR SUPPLY
- A Both tractor and trailer brakes simultaneously
- B The tractor service brakes only
- C The parking brake
- D The trailer service brakes only
- A Stop suddenly
- B Spin out
- C Roll over before sliding
- D Lose engine power
- A Loose lug nuts only
- B Cuts, abrasions, and worn seals
- C Cargo placement
- D Engine oil leaks
- A Can be detected during pre-trip inspection by visual and pressure checks
- B Are caused by low fuel
- C Need a mechanic to find
- D Show up only at high speed
- A Honk the horn
- B Disconnect the electrical line first
- C Drain the air tanks
- D Lower the trailer landing gear and chock the trailer wheels
- A All of the above
- B Misalignment between tractor and trailer
- C Cracks in the kingpin
- D Loose or missing fifth-wheel mounting bolts
- A Should be replaced when worn beyond manufacturer specs
- B Make the truck quieter
- C Are normal until the lining is gone
- D Only need attention every 5 years
- A The trailer wheels lock briefly
- B The brakes are released gently
- C You are driving slowly
- D The drive wheels lock and the trailer pushes the tractor sideways
- A Small trailer movement
- B Loss of brake pressure
- C No effect
- D Large trailer angle changes; small inputs are key
- A Trailer sway in crosswinds
- B Reduced visibility along the trailer
- C Off-tracking on right turns
- D All of the above
- A Pressing the pedal once at startup
- B Listening to the brake light
- C Asking a mechanic
- D Performing the seven-step air-brake check before each trip
- A Carries electrical power
- B Sends air pressure to apply trailer service brakes
- C Sends supply air to the trailer reservoirs
- D Drains the trailer reservoir
- A The fifth wheel breaks
- B The trailer brakes lock up
- C The tractor brakes lock up
- D A wheel bearing fails
- A Worn out tires
- B Driving too fast for conditions and/or too closely
- C Engine failure
- D Cargo movement
- A Smoke from the cab
- B Pulling, sticking, or unusual feel as you apply the brakes
- C Engine knocking
- D Steering wander only
- A You will notice immediately because trailer brakes will not work properly
- B Nothing will happen
- C The horn will sound
- D The trailer brakes will be locked on
- A Cargo placement
- B Engine wear
- C Driver fatigue
- D Air leakage in the supply line, low pressure, or a brake-balance issue
- A Brake adjustment levers
- B Electrical connectors
- C Coupling devices for connecting tractor air lines to the trailer
- D Manual transmission shifters
- A It is the standard procedure
- B It is illegal in some states
- C It can damage the cab and the trailer (cab corner crush)
- D It is fine if you are careful
Study tips for the West Virginia Combination Vehicles exam
The Combination Vehicles portion of the West Virginia CDL exam is graded out of the bank of questions the West Virginia Division of Motor Vehicles draws from each year. While the exact bank is not published, every question is sourced from the Combination Vehicles chapter of the West Virginia 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 West Virginia 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 West Virginia Division of Motor Vehicles 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 West Virginia 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 West Virginia 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 West Virginia Division of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: WV General Knowledge · WV Air Brakes · WV Hazardous Materials · WV Passenger · WV School Bus · WV Tank Vehicle · WV Doubles / Triples
New to the CDL process in West Virginia? Read How to apply for a CDL in West Virginia for the document checklist and step-by-step timeline.