Wyoming Combination Vehicles CDL Practice Test
Below are 25 exam-style questions for the Wyoming Combination Vehicles CDL knowledge test, modeled on the FMCSA-aligned content used by the Wyoming Department of Transportation. 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 Listen for a click
- B Tug the trailer with the trailer parking brakes set
- C Look at the locking jaws only
- D Honk the horn
- A Accelerate
- B Release the brakes to allow the trailer wheels to roll again, then steer
- C Disconnect the air supply
- D Apply the trailer hand valve harder
- A Is part of the tractor
- B Is used only when triple-towing
- C Replaces the fifth wheel on the tractor
- D Is used to convert a semitrailer into a full trailer for towing in combination
- A No effect on safety
- B Stopping distances increase and the trailer can swing
- C Steering becomes easier
- D Stopping distances are normal
- A Empty
- B Too high — it can damage the kingpin or skip over the fifth wheel
- C Properly chocked
- D Loaded
- A Off-tracking on right turns
- B All of the above
- C Reduced visibility along the trailer
- D Trailer sway in crosswinds
- A Stop traffic by signaling left
- B Use the shoulder
- C Turn from the left lane
- D Stay in the right lane and swing the front of the tractor wide enough to clear the curb without inviting cars to pass on the right
- A Spin out
- B Lose engine power
- C Stop suddenly
- D Roll over before sliding
- A Drive wheels never lock
- B Brake balance is irrelevant
- C ABS prevents jackknife in all cases
- D Trailer wheels lock more often than drive wheels in panic stops
- A Lane positioning at intersections
- B The trailer following the same path as the tractor in a straight line
- C The fuel mileage
- D Cargo placement
- A Two car lengths
- B No specific rule
- C One second per 10 feet of vehicle length below 40 mph, plus one extra second above 40 mph
- D A vehicle length
- A Triangular, green, marked SERVICE
- B Round, blue, marked TRACTOR
- C Square, white, marked CHARGE
- D Octagonal, red, marked TRAILER AIR SUPPLY
- A Set only the tractor parking brake
- B Set both tractor and trailer parking brakes
- C Use the trailer hand valve
- D Leave the engine running with the brakes off
- A Fully raised before driving
- B Always halfway extended
- C Disconnected before driving
- D Lowered to the ground while driving
- A It is shorter than a straight truck
- B It uses air brakes
- C Its tires are wider
- D Its center of gravity is high
- A Loaded last
- B First (closest to the tractor)
- C Either position is fine
- D Last
- A Air for the brakes
- B Fuel
- C Hydraulic fluid
- D Electrical power for trailer lights and ABS
- A Stops faster than when loaded
- B May actually take longer to stop because brakes are designed for the loaded weight
- C Stops in the same distance
- D Stops only with parking brake
- A Drains the wet tank
- B Carries electrical signals
- C Sends supply air to the trailer reservoirs and controls the trailer emergency brakes
- D Operates the parking brake only
- A Engine knocking
- B Smoke from the cab
- C Steering wander only
- D Pulling, sticking, or unusual feel as you apply the brakes
- A No effect
- B Large trailer angle changes; small inputs are key
- C Small trailer movement
- D Loss of brake pressure
- A Hold the vehicle when parking
- B Test the trailer brakes
- C Both for parking and to prevent jackknife
- D Apply trailer brakes momentarily
- A The trailer to come uncoupled
- B Rust on the cab
- C Tire wear only
- D Engine damage
- A It is fine if you are careful
- B It can damage the cab and the trailer (cab corner crush)
- C It is illegal in some states
- D It is the standard procedure
- A A height where the tractor will lift the trailer slightly when backing under
- B Whatever height it happens to be
- C A height that requires the tractor to drop down to fit
- D Maximum legal height
Study tips for the Wyoming Combination Vehicles exam
The Combination Vehicles portion of the Wyoming CDL exam is graded out of the bank of questions the Wyoming Department of Transportation draws from each year. While the exact bank is not published, every question is sourced from the Combination Vehicles chapter of the Wyoming 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 Wyoming 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 Wyoming Department of Transportation 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 Wyoming 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 Wyoming 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 Wyoming Department of Transportation office.
Already comfortable with this endorsement? Drill another: WY General Knowledge · WY Air Brakes · WY Hazardous Materials · WY Passenger · WY School Bus · WY Tank Vehicle · WY Doubles / Triples
New to the CDL process in Wyoming? Read How to apply for a CDL in Wyoming for the document checklist and step-by-step timeline.