Indiana Doubles / Triples CDL Practice Test
Below are 25 exam-style questions for the Indiana Doubles / Triples CDL knowledge test, modeled on the FMCSA-aligned content used by the Indiana Bureau 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 Couple without verifying
- B Allow the dolly to roll freely
- C Skip the air check
- D Verify the dolly's air tank has air pressure and lock the dolly's parking brake before backing under the second trailer
- A Drive as if it were a single trailer
- B Skip the pre-trip
- C Be aware of the increased complexity of the equipment and operate accordingly
- D Use the trailer hand valve as a parking brake
- A Increase speed
- B Maintain speed
- C Slow down before the curve to reduce rollover risk and trailer swing
- D Brake within the curve
- A Wind, especially crosswinds and from passing trucks
- B All of the above
- C Lane changes
- D Cargo placement
- A It is harder to roll over
- B Better fuel mileage
- C No change in handling
- D It can sway and lift more easily; drive carefully
- A Is the same as a fifth wheel jaw
- B Is electrical
- C Is decorative
- D Prevents accidental release of the hook
- A The rear trailer
- B The tractor
- C The converter dolly
- D The first trailer
- A Brake hard
- B Reduce speed gradually and avoid sudden steering inputs
- C Steer sharply to correct
- D Accelerate
- A First (closest to the tractor)
- B In the middle
- C It does not matter
- D Last (furthest from the tractor)
- A Use only mirrors
- B Back at full speed
- C Have a passenger guide you
- D Avoid it; if necessary, uncouple to a single trailer first
- A Skip the spotter
- B Avoid backing whenever possible; use a spotter when needed
- C Back at full speed
- D Use only mirrors
- A Coupling and uncoupling procedures
- B How to inspect each connection point
- C All of the above
- D State and federal route restrictions
- A The second trailer's emergency brakes apply automatically
- B Nothing happens
- C The first trailer accelerates
- D The tractor brakes apply
- A Handling and braking are affected
- B Better fuel mileage
- C Better handling
- D No effect
- A Set only the tractor parking brake
- B Leave brakes off
- C Set parking brakes on the tractor and on the trailers
- D Use the trailer hand valve
- A Are decorative
- B Carry electrical signals
- C Are required only on triples
- D Provide a backup connection in case the primary coupling fails
- A Skip the brake-light test
- B Skip the parking-brake test
- C Skip the air-leak rate check
- D All of the above
- A Is less likely to roll
- B Is more likely to roll than the first
- C Has the same rollover risk
- D Cannot roll
- A All of the above
- B Back without a spotter when possible
- C Drive faster than conditions allow
- D Skip the air-brake check
- A Allow chains to drag
- B Allow loose engagement
- C Verify it is properly engaged and safety chains are attached
- D Skip the safety chains
- A Skip the testing
- B Some lines may be optional
- C Test only one line
- D All air lines and electrical lines should be connected and tested
- A Drop first trailer, hook converter dolly to first trailer, back tractor to second trailer, etc.
- B Tractor to second trailer first
- C Trailers first, then tractor
- D Random order
- A Brakes are uneven
- B Only the rear trailer brakes
- C Only the first trailer brakes
- D All trailers should brake together if the system is functioning correctly
- A Tractor and trailer brakes
- B All trailer service brakes simultaneously
- C Only the rear trailer brakes
- D Only the first trailer brakes
- A A train carrying buses
- B A combination with a second trailer that has a kingpin attached to the first trailer
- C A type of car carrier
- D A type of bus
Study tips for the Indiana Doubles / Triples exam
The Doubles / Triples portion of the Indiana CDL exam is graded out of the bank of questions the Indiana Bureau 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 Indiana 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 Indiana 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 Indiana Bureau 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 Indiana 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 Indiana 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 Indiana Bureau of Motor Vehicles office.
Already comfortable with this endorsement? Drill another: IN General Knowledge · IN Air Brakes · IN Combination Vehicles · IN Hazardous Materials · IN Passenger · IN School Bus · IN Tank Vehicle
New to the CDL process in Indiana? Read How to apply for a CDL in Indiana for the document checklist and step-by-step timeline.