Not affiliated with any state DMV or AAMVA. Original questions based on the Texas Commercial Motor Vehicle Drivers Handbook (DL-7C, revised March 2026).
CDL combination vehicles test: practice test with original questions from a state CDL handbook
Practice for the CDL combination vehicles test knowledge test with 54 original questions written from a state CDL handbook based on the national model manual (Texas DL-7C, revised March 2026), in English and Spanish.
54 questions · Modes: Study, Topic drill, Daily 5
About this test
Practice for the CDL combination vehicles test knowledge test with original questions written from the matching section of the Texas Commercial Motor Vehicle Drivers Handbook (DL-7C, revised March 2026), which follows the national AAMVA model CDL manual used by most states. Every correct answer is backed by a passage of the handbook and checked by two independent verifiers.
- Study: every question with a short explanation.
- Topic drills: driving combination vehicles safely, combination vehicle air brakes, coupling and uncoupling, inspecting a combination vehicle.
- Mock test: not offered, because the handbook states the 80% pass mark but not the number of questions.
The questions are written in our own words in English and Spanish; this is not any state's question bank. The CDL general knowledge test and other endorsements are separate pages.
Topics
- ABS and stopping distance · 1
- ABS malfunction · 1
- ABS requirement · 1
- Air supply control shape · 1
- Backing path · 1
- Backing under the trailer · 1
- Bobtail tractors · 1
- Causes of rollover · 1
- Checking emergency line · 1
- Checking the connection · 1
- Chocking when uncoupling · 1
- Connecting glad hands · 1
- Correcting drift · 1
- Crossed air-lines · 1
- Draining air tanks · 1
- Easing pressure on jaws · 1
- Electrical cable · 1
- Emergency air-line · 1
- Emergency line pressure loss · 1
- Faulty protection valve · 1
- Fifth wheel jaws · 1
- Fifth wheel locking jaws · 1
- Fifth wheel lubrication · 1
- Fifth wheel position · 1
- Following distance · 1
- Hand valve vs foot pedal · 1
- Inspecting the coupling · 1
- Inspection procedure · 1
- Landing gear · 1
- Line colors · 1
- Loaded trailer landing gear · 1
- Load position · 1
- Off-tracking · 1
- Parking with hand valve · 1
- Positioning the tractor · 1
- Preventing rollover · 1
- Pulling clear · 1
- Rearward amplification · 1
- Recognizing a skid · 1
- Rollover deaths · 1
- Rollover risk · 1
- Service air-line · 1
- Shut-off valves · 1
- Stopping empty · 1
- Stuck on railroad tracks · 1
- Testing service brakes · 1
- Testing the tractor protection valve · 1
- Tractor protection valve · 1
- Trailer air supply control · 1
- Trailer hand valve · 1
- Trailer height · 1
- Trailers without spring brakes · 1
- Valve closing pressure · 1
- Wrong trailer height · 1
Sources and version
- Texas Commercial Motor Vehicle Drivers Handbook (DL-7C)Covers: Revised March 2026
Covers: Texas DL-7C, revised March 2026 · Verified current as of Oct 28, 2026
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How this page was made
Written by AI from the sources listed above, checked automatically, not reviewed by a person. Where the source licence allows it the questions keep the source wording; otherwise they are original questions based on the source. Every answer shows its source. This is not legal, immigration, medical or financial advice.