Missouri Tank Vehicle CDL Practice Test
Below are 25 exam-style questions for the Missouri Tank Vehicle CDL knowledge test, modeled on the FMCSA-aligned content used by the Missouri Department of Revenue. 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 Reduces engine noise
- B Operates the brakes
- C Improves fuel mileage
- D Captures vapors during loading and unloading to reduce emissions
- A Is divided into separate compartments
- B Is illegal in the U.S.
- C Has internal walls with holes that slow liquid movement
- D Has no internal structure
- A On a curve or off-ramp at speeds the driver thought were safe
- B In low-speed maneuvers
- C On straight roads
- D In stopped traffic
- A Coast in neutral
- B Look for an escape ramp
- C Use the parking brake harder
- D Increase speed to clear the descent
- A Skip pre-trip checks of vents and covers
- B Use the trailer hand valve as a parking brake
- C Drive at the posted speed regardless of conditions
- D Be ready for surge during stops, starts, and turns
- A Use the trailer hand valve as a parking brake
- B Disregard surge
- C Skip outage
- D All of the above
- A Manhole covers and vents
- B The tank shell for corrosion or damage
- C Special pump and valve systems
- D All of the above
- A Easier handling
- B Higher rollover risk
- C Faster acceleration
- D No change in handling
- A Avoid all freeways
- B Use the parking brake on grades
- C Avoid steep grades and sharp curves where possible
- D Take the shortest route regardless of grade
- A Bond only after the loading is complete
- B Disconnect the bonding mid-loading
- C Bond and ground before opening the manhole
- D Skip the bonding if the load is small
- A Has more surge than a full or empty tank
- B Has less surge than a full tank
- C Has no surge
- D Has the same surge
- A It carries any liquid
- B It has a tank with rated capacity of 1,000 gallons or more (single tank or aggregate of portable tanks)
- C It is a flatbed
- D It carries dry cargo
- A A tank leak
- B The empty space left in a tank for product expansion
- C A driver shortage
- D Equipment failure
- A Allow product to leak until empty
- B Stop, isolate the area, and notify emergency services and the carrier
- C Drive faster to limit the spill
- D Continue to the destination
- A Push you forward after you stop
- B Improve traction
- C Help you stop sooner
- D Have no effect
- A Maintain posted speed
- B Slow well below posted speed and watch for surge as you change direction
- C Honk and proceed
- D Use the inside lane only
- A Use the trailer hand valve
- B Set only the tractor parking brake
- C Leave brakes off
- D Set both tractor and trailer parking brakes and chock if necessary
- A Is the same as smooth-bore
- B Has no baffles
- C Has only one section
- D Has separate sections for different products
- A Allow the receiver to verify later
- B Trust the loader to handle it
- C Skip the verification
- D Verify the correct product, quantity, and compatibility with the tank
- A Increase speed
- B Slow down before the curve, not in it
- C Brake within the curve
- D Maintain speed
- A Drive normally
- B Allow extra following distance and brake earlier
- C Disregard surge
- D Use only the parking brake to slow
- A Skip the venting
- B Open vents while pressure is high
- C Drive while unloading
- D Open vents only after pressure is equalized
- A Verify product compatibility and follow safety procedures
- B Mix freely
- C Allow the receiver to add chemicals
- D Skip the safety check
- A Smooth and gradual to minimize side-to-side surge
- B Without signaling
- C At any speed
- D Sharp and quick
- A Try to repair the leak yourself
- B Continue to the destination
- C Drive faster
- D Stop in a safe location, isolate the area, and notify the carrier and authorities
Study tips for the Missouri Tank Vehicle exam
The Tank Vehicle portion of the Missouri CDL exam is graded out of the bank of questions the Missouri Department of Revenue draws from each year. While the exact bank is not published, every question is sourced from the Tank Vehicle chapter of the Missouri 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 Missouri 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 Tank Vehicle.
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 Missouri Department of Revenue 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 Tank Vehicle 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 Missouri General Knowledge practice test before scheduling the real exam.
Next steps
Missed more than four questions? Re-read the Tank Vehicle study guide and the matching chapter in the official Missouri 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 Missouri Department of Revenue office.
Already comfortable with this endorsement? Drill another: MO General Knowledge · MO Air Brakes · MO Combination Vehicles · MO Hazardous Materials · MO Passenger · MO School Bus · MO Doubles / Triples
New to the CDL process in Missouri? Read How to apply for a CDL in Missouri for the document checklist and step-by-step timeline.