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NY · GK (Class A) Endorsement

New York Combination Vehicles CDL Practice Test

Below are 25 exam-style questions for the New York Combination Vehicles CDL knowledge test, modeled on the FMCSA-aligned content used by the New York State Department 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.

Heads up: this is a study tool, not a graded exam. Cover the answer with your hand or a sheet of paper for an honest practice run, then re-read the explanations for any questions you missed. Aim for 22 out of 25 or better, three times in a row, before scheduling the real exam.
Question 1 of 25
Which is true about combination braking?
  • A Trailer wheels lock more often than drive wheels in panic stops
  • B Drive wheels never lock
  • C ABS prevents jackknife in all cases
  • D Brake balance is irrelevant
Correct answer: A
Empty trailer wheels lock easily and contribute to jackknife and trailer-swing risks.
Question 2 of 25
The proper sequence for uncoupling is generally:
  • A No specific order is required
  • B Lower landing gear, disconnect lines, release fifth wheel, pull tractor away
  • C Pull tractor away first, then disconnect lines
  • D Release fifth wheel first, then connect lines
Correct answer: B
Lower the landing gear, chock the wheels, disconnect air and electrical lines and stow them, release the fifth wheel, then slowly pull the tractor forward.
Question 3 of 25
Which of the following can damage a fifth wheel?
  • A Failure to grease
  • B All of the above
  • C Coupling with the trailer too high
  • D Backing too fast
Correct answer: B
All three: high trailer skips the jaws, fast backing impacts hardware, and lack of lubrication accelerates wear.
Question 4 of 25
When you make a wide right turn, you should:
  • A Use the shoulder
  • B Stop traffic by signaling left
  • C Stay in the right lane and swing the front of the tractor wide enough to clear the curb without inviting cars to pass on the right
  • D Turn from the left lane
Correct answer: C
Use only as much room as needed and keep the right side blocked to following vehicles.
Question 5 of 25
A safe combination-vehicle following distance is at least:
  • A One second per 10 feet of vehicle length below 40 mph, plus one extra second above 40 mph
  • B A vehicle length
  • C No specific rule
  • D Two car lengths
Correct answer: A
A 60-ft combination needs at least 6 seconds under 40 mph, 7 seconds above 40 mph.
Question 6 of 25
Trailer ABS uses:
  • A Hydraulic brakes
  • B A separate compressor
  • C Hand valves
  • D Sensors at each wheel that release brake pressure when wheel lockup is detected
Correct answer: D
Wheel-speed sensors trigger valves to release pressure when lockup is detected.
Question 7 of 25
The crank handle on the landing gear should:
  • A Be in the stowed (high) position when traveling
  • B Be in the low position when traveling
  • C Be locked at half-height
  • D Be removed
Correct answer: A
Stow the crank up so it doesn't catch on something while traveling.
Question 8 of 25
After coupling, the locking jaws should:
  • A Be missing
  • B Be loose
  • C Be open
  • D Be closed around the shank of the kingpin (not on the head)
Correct answer: D
Visual check: jaws around the shank, not the head. A flashlight helps.
Question 9 of 25
When the trailer brakes are operating but pulling weakly, this can indicate:
  • A Air leakage in the supply line, low pressure, or a brake-balance issue
  • B Cargo placement
  • C Engine wear
  • D Driver fatigue
Correct answer: A
Weak trailer brakes are usually an air-system problem and require diagnosis before continuing.
Question 10 of 25
Trailer parking brakes are released:
  • A By the trailer hand valve
  • B By setting the red trailer-air-supply valve
  • C By pulling out the red trailer-air-supply valve
  • D By pushing in the red trailer-air-supply valve
Correct answer: D
Pushing in the red knob charges the trailer brakes and releases the spring brakes.
Question 11 of 25
Tracking refers to:
  • A Lane positioning at intersections
  • B The trailer following the same path as the tractor in a straight line
  • C The fuel mileage
  • D Cargo placement
Correct answer: B
Tracking is how well the trailer follows the tractor; misalignment can indicate suspension or tire problems.
Question 12 of 25
If you are pulling two trailers, the heavier trailer should be:
  • A Loaded last
  • B First (closest to the tractor)
  • C Last
  • D Either position is fine
Correct answer: B
Heavier trailer first reduces the rear-trailer crack-the-whip effect.
Question 13 of 25
The "emergency" line (supply line) on a tractor-trailer:
  • A Drains the wet tank
  • B Operates the parking brake only
  • C Sends supply air to the trailer reservoirs and controls the trailer emergency brakes
  • D Carries electrical signals
Correct answer: C
Loss of pressure on the emergency line causes the trailer's emergency brake to apply automatically.
Question 14 of 25
The fifth-wheel locking lever should be:
  • A Tied with rope
  • B Locked and the safety latch in place after coupling
  • C Removed before driving
  • D Released and visible after coupling
Correct answer: B
After backing under, the locking jaws must close around the kingpin and the safety latch must be in place.
Question 15 of 25
The trailer hand valve should NOT be used to:
  • A Both for parking and to prevent jackknife
  • B Test the trailer brakes
  • C Apply trailer brakes momentarily
  • D Hold the vehicle when parking
Correct answer: A
Don't use it to park (it can leak off) or to prevent a jackknife (it locks the trailer wheels and worsens the skid).
Question 16 of 25
A converter dolly:
  • A Is used to convert a semitrailer into a full trailer for towing in combination
  • B Is used only when triple-towing
  • C Is part of the tractor
  • D Replaces the fifth wheel on the tractor
Correct answer: A
A converter dolly turns a semitrailer into a full trailer that can be coupled behind another trailer.
Question 17 of 25
When backing into a dock, you should:
  • A Back at full speed
  • B GOAL — Get Out And Look — and walk around the trailer first
  • C Use only mirrors
  • D Have the dispatcher in the cab
Correct answer: B
A walk-around catches obstacles, people, and overhead clearance issues before you back.
Question 18 of 25
When the trailer begins to skid, you should:
  • A Release the brakes to allow the trailer wheels to roll again, then steer
  • B Apply the trailer hand valve harder
  • C Disconnect the air supply
  • D Accelerate
Correct answer: A
Releasing the brakes lets the wheels rotate again so the trailer can recover its tracking.
Question 19 of 25
When backing a tractor-trailer, you should:
  • A Always back to the right
  • B Back without using mirrors
  • C Back as fast as practical
  • D Back to the left whenever possible because you can see better
Correct answer: D
Backing to the driver's side gives the best view of the trailer. Always GOAL — Get Out And Look — before and during.
Question 20 of 25
Off-tracking means:
  • A The trailer wheels follow a tighter arc than the tractor wheels in a turn
  • B Sliding sideways
  • C Loss of traction
  • D Driving off the road
Correct answer: A
In a right turn, the trailer wheels cut the corner. To compensate, the tractor must swing wider.
Question 21 of 25
When inspecting the air lines between tractor and trailer, look for:
  • A Loose lug nuts only
  • B Engine oil leaks
  • C Cargo placement
  • D Cuts, abrasions, and worn seals
Correct answer: D
Air-line condition is a typical roadside inspection focus on combinations.
Question 22 of 25
The trailer landing gear (dolly legs) should be:
  • A Always halfway extended
  • B Fully raised before driving
  • C Disconnected before driving
  • D Lowered to the ground while driving
Correct answer: B
Landing gear must be fully raised and the crank handle secured before moving the trailer.
Question 23 of 25
Most rear-end collisions caused by combination vehicles result from:
  • A Cargo movement
  • B Driving too fast for conditions and/or too closely
  • C Engine failure
  • D Worn out tires
Correct answer: B
Speed and following distance dominate the causes. Increase cushion and slow down.
Question 24 of 25
During a brake check before moving, you should look for:
  • A Pulling, sticking, or unusual feel as you apply the brakes
  • B Smoke from the cab
  • C Engine knocking
  • D Steering wander only
Correct answer: A
Low-speed brake test identifies pulling, sticking, or weakness so you don't discover it on the highway.
Question 25 of 25
When you turn a combination vehicle right at an intersection, you should:
  • A Swing wide to the right first to avoid hitting the curb
  • B Stop in the middle of the turn
  • C Swing left then right
  • D Keep the cab close to the curb and swing the front out so following cars cannot squeeze beside you on the right
Correct answer: D
Hugging the right side of the turn lane prevents another vehicle from squeezing in next to you and getting clipped by the trailer.

Study tips for the New York Combination Vehicles exam

The Combination Vehicles portion of the New York CDL exam is graded out of the bank of questions the New York State Department of Motor Vehicles draws from each year. While the exact bank is not published, every question is sourced from the Combination Vehicles chapter of the New York 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 York 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 Combination Vehicles.

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 York State Department 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 Combination Vehicles 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 York General Knowledge practice test before scheduling the real exam.

Next steps

Missed more than four questions? Re-read the Combination Vehicles study guide and the matching chapter in the official New York 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 York State Department of Motor Vehicles office.

Already comfortable with this endorsement? Drill another: NY General Knowledge · NY Air Brakes · NY Hazardous Materials · NY Passenger · NY School Bus · NY Tank Vehicle · NY Doubles / Triples

New to the CDL process in New York? Read How to apply for a CDL in New York for the document checklist and step-by-step timeline.