North Dakota Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the North Dakota Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the North Dakota 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 Skip the air check
- B Verify the dolly's air tank has air pressure and lock the dolly's parking brake before backing under the second trailer
- C Allow the dolly to roll freely
- D Couple without verifying
- A Park it on level ground with the parking brake set or wheels chocked
- B Connect it to a random trailer
- C Leave it on a slope
- D Disable the brakes
- A Federal and state rules vary; T endorsement does not override route restrictions
- B Restrictions apply only to hazmat
- C T endorsement allows triples everywhere
- D There are no restrictions
- A Once a year
- B Never; the dispatcher tests them
- C Only at the destination
- D Before pulling away from the coupling site
- A No effect
- B Better fuel mileage
- C Better handling
- D Handling and braking are affected
- A Any lane
- B The left lane
- C The right lane on multilane highways when possible
- D The shoulder
- A Plan the change well in advance, signal early, and change when there is ample space
- B Cut between cars
- C Change quickly to fit in
- D Skip the signal
- A Reduce speed gradually and avoid sudden steering inputs
- B Accelerate
- C Brake hard
- D Steer sharply to correct
- A More opportunities for tire failure and more inspection points
- B Better handling
- C Fewer inspection points
- D No effect on safety
- A Accelerate
- B Brake hard
- C Steer sharply to correct
- D Reduce speed gradually and avoid sudden steering inputs
- A All of the above
- B State and federal route restrictions
- C How to inspect each connection point
- D Coupling and uncoupling procedures
- A Slow down before the curve to reduce rollover risk and trailer swing
- B Brake within the curve
- C Increase speed
- D Maintain speed
- A Should change lanes frequently
- B Should be driven slowly with extra following distance
- C Can maintain normal speed
- D Should brake hard
- A Fuel tanks
- B Engines
- C Air lines, electrical lines, and connection points
- D Drivers
- A Brakes are uneven
- B All trailers should brake together if the system is functioning correctly
- C Only the rear trailer brakes
- D Only the first trailer brakes
- A Is a single hook
- B Includes a pintle hook on the front and a fifth wheel on the back
- C Is the same as a tractor fifth wheel
- D Is electrical only
- A Avoid it; if necessary, uncouple to a single trailer first
- B Back at full speed
- C Use only mirrors
- D Have a passenger guide you
- A The tractor
- B The rear trailer
- C The converter dolly
- D The first trailer
- A Wind, especially crosswinds and from passing trucks
- B All of the above
- C Lane changes
- D Cargo placement
- A Mechanical brakes only
- B No air-brake system
- C Air lines only on the tractor
- D Air lines from tractor to first trailer to dolly to second trailer
- A Off-tracking is more pronounced; swing wider than for a single trailer
- B No off-tracking occurs
- C Off-tracking is less than a single trailer
- D Use the left lane
- A Inspect once a year
- B Look for damage that could affect cargo securement or trailer integrity
- C Skip the floor inspection
- D Allow damage
- A Trust visual inspection only
- B Verify the fifth wheel locks around the kingpin and test by tugging gently
- C Skip the lock verification
- D Couple at high speed
- A Tractor cannot jackknife
- B Speed is reduced faster
- C Brakes work better
- D Rear trailer can swing out and cause loss of control
- A Steer sharply
- B Accelerate
- C Brake hard
- D Reduce speed gradually and avoid sudden steering inputs
Study tips for the North Dakota Doubles / Triples exam
The Doubles / Triples portion of the North Dakota CDL exam is graded out of the bank of questions the North Dakota Department of Transportation draws from each year. While the exact bank is not published, every question is sourced from the Doubles / Triples chapter of the North Dakota 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 North Dakota 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 North Dakota 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 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 North Dakota 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 North Dakota 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 North Dakota Department of Transportation office.
Already comfortable with this endorsement? Drill another: ND General Knowledge · ND Air Brakes · ND Combination Vehicles · ND Hazardous Materials · ND Passenger · ND School Bus · ND Tank Vehicle
New to the CDL process in North Dakota? Read How to apply for a CDL in North Dakota for the document checklist and step-by-step timeline.