New Hampshire Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the New Hampshire Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the New Hampshire Division of Motor Vehicles. 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 Air lines from tractor to first trailer to dolly to second trailer
- B Air lines only on the tractor
- C Mechanical brakes only
- D No air-brake system
- A Back at full speed
- B Have a passenger guide you
- C Avoid it; if necessary, uncouple to a single trailer first
- D Use only mirrors
- A Two tractors pulling one trailer
- B A trailer with two axles
- C A bus with two sections
- D Two trailers behind one tractor
- A Skip the signal
- B Change quickly to fit in
- C Cut between cars
- D Plan the change well in advance, signal early, and change when there is ample space
- A Steer sharply to correct
- B Brake hard
- C Accelerate
- D Reduce speed gradually and avoid sudden steering inputs
- A Only on Interstate 80
- B On all U.S. highways
- C In some states; restrictions vary
- D In Canada only
- A Potential rollover at curves
- B All of the above
- C Lane changes that swing the rear
- D Crosswind effects on the rear trailer
- A Accelerate
- B Steer sharply
- C Reduce speed gradually and avoid sudden steering inputs
- D Brake hard
- A Disconnect at high speed
- B Allow the dolly to roll
- C Set the parking brake or chock the wheels before disconnecting
- D Skip the parking brake
- A No specific length
- B Tractor length only
- C Total combination length when turning, parking, and changing lanes
- D Trailer length only
- A Are required only on triples
- B Provide a backup connection in case the primary coupling fails
- C Carry electrical signals
- D Are decorative
- A Verify they are crossed under the pintle hook and not dragging
- B Skip the inspection
- C Tie them in knots
- D Allow them to drag
- A A type of bus
- B A train carrying buses
- C A combination with a second trailer that has a kingpin attached to the first trailer
- D A type of car carrier
- A Better handling
- B Fewer inspection points
- C More opportunities for tire failure and more inspection points
- D No effect on safety
- A Only the first trailer brakes
- B Brakes are uneven
- C Only the rear trailer brakes
- D All trailers should brake together if the system is functioning correctly
- A All of the above
- B How to inspect each connection point
- C State and federal route restrictions
- D Coupling and uncoupling procedures
- A The tractor brakes apply
- B Nothing happens
- C The second trailer's emergency brakes apply automatically
- D The first trailer accelerates
- A Last (furthest from the tractor)
- B In the middle
- C It does not matter
- D First (closest to the tractor)
- 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 It uses different brakes
- B It is shorter
- C Total length and weight increase stopping distance and require more reaction time
- D It accelerates faster
- A All of the above
- B Dolly air-tank pressure
- C Glad hands and seals at every connection
- D Pintle hooks and safety chains
- A Speed is reduced faster
- B Brakes work better
- C Tractor cannot jackknife
- D Rear trailer can swing out and cause loss of control
- A All of the above
- B Drive faster than conditions allow
- C Back without a spotter when possible
- D Skip the air-brake check
- A Should be driven slowly with extra following distance
- B Should brake hard
- C Can maintain normal speed
- D Should change lanes frequently
- 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
Study tips for the New Hampshire Doubles / Triples exam
The Doubles / Triples portion of the New Hampshire CDL exam is graded out of the bank of questions the New Hampshire Division of Motor Vehicles draws from each year. While the exact bank is not published, every question is sourced from the Doubles / Triples chapter of the New Hampshire 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 New Hampshire 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 New Hampshire Division of Motor Vehicles 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 New Hampshire 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 New Hampshire 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 New Hampshire Division of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: NH General Knowledge · NH Air Brakes · NH Combination Vehicles · NH Hazardous Materials · NH Passenger · NH School Bus · NH Tank Vehicle
New to the CDL process in New Hampshire? Read How to apply for a CDL in New Hampshire for the document checklist and step-by-step timeline.