Minnesota Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the Minnesota Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the Minnesota Driver and Vehicle 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 Dolly air-tank pressure
- B Glad hands and seals at every connection
- C All of the above
- D Pintle hooks and safety chains
- A Drive faster than conditions allow
- B Skip the air-brake check
- C Back without a spotter when possible
- D All of the above
- A Only the rear trailer brakes
- B Tractor and trailer brakes
- C Only the first trailer brakes
- D All trailer service brakes simultaneously
- A Brakes work better
- B Tractor cannot jackknife
- C Rear trailer can swing out and cause loss of control
- D Speed is reduced faster
- A Engines
- B Fuel tanks
- C Air lines, electrical lines, and connection points
- D Drivers
- A Can maintain normal speed
- B Should brake hard
- C Should change lanes frequently
- D Should be driven slowly with extra following distance
- A Replace the fifth wheel on the tractor
- B Move cargo within the trailer
- C Test the brakes
- D Connect a semitrailer to another trailer to form a combination
- A Reverse of coupling — disconnect rear trailer first, then dolly
- B Random order
- C No specific order
- D Disconnect tractor first
- A The converter dolly
- B The rear trailer
- C The first trailer
- D The tractor
- A Tractor to second trailer first
- B Drop first trailer, hook converter dolly to first trailer, back tractor to second trailer, etc.
- C Trailers first, then tractor
- D Random order
- A On all U.S. highways
- B Only on Interstate 80
- C In Canada only
- D In some states; restrictions vary
- A Disconnect at high speed
- B Set the parking brake or chock the wheels before disconnecting
- C Skip the parking brake
- D Allow the dolly to roll
- A Inspect once a year
- B Allow damage
- C Skip the floor inspection
- D Look for damage that could affect cargo securement or trailer integrity
- A Cannot roll
- B Has the same rollover risk
- C Is more likely to roll than the first
- D Is less likely to roll
- A A tire blowout
- B A loose load shifting
- C The rear trailer swinging more than the tractor in turns or lane changes
- D A driver punishing the truck
- A No specific length
- B Trailer length only
- C Total combination length when turning, parking, and changing lanes
- D Tractor length only
- A More opportunities for tire failure and more inspection points
- B Better handling
- C No effect on safety
- D Fewer inspection points
- A It can sway and lift more easily; drive carefully
- B It is harder to roll over
- C No change in handling
- D Better fuel mileage
- A Use the trailer hand valve to charge
- B Skip the charge
- C Couple without checking
- D Charge it before coupling and verify pressure
- A Allow them to drag
- B Tie them in knots
- C Verify they are crossed under the pintle hook and not dragging
- D Skip the inspection
- A Replace before operating
- B Continue with damaged tires
- C Use the spare
- D Ignore the damage
- A T endorsement allows triples everywhere
- B Restrictions apply only to hazmat
- C There are no restrictions
- D Federal and state rules vary; T endorsement does not override route restrictions
- A Be aware of the increased complexity of the equipment and operate accordingly
- B Skip the pre-trip
- C Drive as if it were a single trailer
- D Use the trailer hand valve as a parking brake
- A Is decorative
- B Is the same as a fifth wheel jaw
- C Is electrical
- D Prevents accidental release of the hook
- A Verify it is properly engaged and safety chains are attached
- B Skip the safety chains
- C Allow loose engagement
- D Allow chains to drag
Study tips for the Minnesota Doubles / Triples exam
The Doubles / Triples portion of the Minnesota CDL exam is graded out of the bank of questions the Minnesota Driver and Vehicle Services draws from each year. While the exact bank is not published, every question is sourced from the Doubles / Triples chapter of the Minnesota 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 Minnesota 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 Doubles / Triples.
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 Minnesota Driver and Vehicle 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 Doubles / Triples 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 Minnesota General Knowledge practice test before scheduling the real exam.
Next steps
Missed more than four questions? Re-read the Doubles / Triples study guide and the matching chapter in the official Minnesota 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 Minnesota Driver and Vehicle Services office.
Already comfortable with this endorsement? Drill another: MN General Knowledge · MN Air Brakes · MN Combination Vehicles · MN Hazardous Materials · MN Passenger · MN School Bus · MN Tank Vehicle
New to the CDL process in Minnesota? Read How to apply for a CDL in Minnesota for the document checklist and step-by-step timeline.