Georgia Combination Vehicles CDL Practice Test
Below are 25 exam-style questions for the Georgia Combination Vehicles CDL knowledge test, modeled on the FMCSA-aligned content used by the Georgia Department 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 The parking brake
- B Both tractor and trailer brakes simultaneously
- C The tractor service brakes only
- D The trailer service brakes only
- A One second per 10 feet of vehicle length below 40 mph, plus one extra second above 40 mph
- B Two car lengths
- C No specific rule
- D A vehicle length
- A Sensors at each wheel that release brake pressure when wheel lockup is detected
- B Hydraulic brakes
- C Hand valves
- D A separate compressor
- A Whatever height it happens to be
- B A height where the tractor will lift the trailer slightly when backing under
- C A height that requires the tractor to drop down to fit
- D Maximum legal height
- A All of the above
- B Failure to grease
- C Coupling with the trailer too high
- D Backing too fast
- A Be open
- B Be missing
- C Be closed around the shank of the kingpin (not on the head)
- D Be loose
- A Stops only with parking brake
- B Stops in the same distance
- C May actually take longer to stop because brakes are designed for the loaded weight
- D Stops faster than when loaded
- A Carries electrical signals
- B Sends supply air to the trailer reservoirs and controls the trailer emergency brakes
- C Drains the wet tank
- D Operates the parking brake only
- A Connect air emergency line first, then service line, then electrical (or per company policy) — verify with brake check
- B Connect electrical first, then air
- C Connect only air; electrical is optional
- D Connect any line first; order doesn't matter
- A Connect the lines back to the tractor
- B Disable the trailer parking brake
- C Move the tractor far away immediately without checking
- D Check that the trailer is stable on its landing gear
- A The tractor parking brake fails
- B The drive wheels lose traction and the tractor begins to slide
- C The trailer is too heavy
- D The fifth wheel disengages
- A Only at the start of the day
- B Before, during, and after coupling
- C Only at the destination
- D Every 3 hours
- A It is fine if you are careful
- B It is illegal in some states
- C It is the standard procedure
- D It can damage the cab and the trailer (cab corner crush)
- A Electrical power for trailer lights and ABS
- B Fuel
- C Air for the brakes
- D Hydraulic fluid
- A Nothing will happen
- B You will notice immediately because trailer brakes will not work properly
- C The horn will sound
- D The trailer brakes will be locked on
- A No specific order is required
- B Lower landing gear, disconnect lines, release fifth wheel, pull tractor away
- C Release fifth wheel first, then connect lines
- D Pull tractor away first, then disconnect lines
- A Test the trailer brakes
- B Apply trailer brakes momentarily
- C Hold the vehicle when parking
- D Both for parking and to prevent jackknife
- A Last
- B Either position is fine
- C First (closest to the tractor)
- D Loaded last
- A Is used to convert a semitrailer into a full trailer for towing in combination
- B Is used only when triple-towing
- C Is part of the tractor
- D Replaces the fifth wheel on the tractor
- A Coupling devices for connecting tractor air lines to the trailer
- B Brake adjustment levers
- C Manual transmission shifters
- D Electrical connectors
- A Brake fade
- B Wheel damage
- C No off-tracking
- D Off-tracking — the trailer wheels follow a tighter arc than the tractor
- A Use only mirrors
- B Have the dispatcher in the cab
- C Back at full speed
- D GOAL — Get Out And Look — and walk around the trailer first
- A Driver fatigue
- B Air leakage in the supply line, low pressure, or a brake-balance issue
- C Cargo placement
- D Engine wear
- A Disconnected before driving
- B Always halfway extended
- C Lowered to the ground while driving
- D Fully raised before driving
- A Need a mechanic to find
- B Show up only at high speed
- C Are caused by low fuel
- D Can be detected during pre-trip inspection by visual and pressure checks
Study tips for the Georgia Combination Vehicles exam
The Combination Vehicles portion of the Georgia CDL exam is graded out of the bank of questions the Georgia Department 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 Georgia 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 Georgia 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 Georgia Department 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 Georgia 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 Georgia 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 Georgia Department of Driver Services office.
Already comfortable with this endorsement? Drill another: GA General Knowledge · GA Air Brakes · GA Hazardous Materials · GA Passenger · GA School Bus · GA Tank Vehicle · GA Doubles / Triples
New to the CDL process in Georgia? Read How to apply for a CDL in Georgia for the document checklist and step-by-step timeline.