APG Practice Tests · New York CDL

New York CDL Study & Practice

Start with the topics for your license class and vehicle, then test your understanding. APG’s original questions are unofficial study aids, not actual DMV exam questions or a complete training course. APG is not affiliated with the DMV.

Official New York DMV CDL ManualThe DMV provides the complete manual as separate PDF sections, with multiple language options. Open its index to read or download the sections you need.Open official CDL manual and PDF downloads ↗

Your study path

Read Section 1 first to identify the license class, restrictions and endorsements you need.
Study driving safety and cargo in Sections 2 and 3.
Add Section 5 for air-brake vehicles and Section 6 for combination vehicles.
Use Sections 11–13 for inspection, vehicle control and road-test preparation.
Add the relevant passenger, school bus, tanker, doubles/triples or hazardous-material sections when needed.

Study support only. Required entry-level driver training must be completed with an FMCSA-registered provider when applicable. Practice vehicle procedures with a qualified instructor.

Official New York CDL application steps · FMCSA training provider registry

Short study lessons

General knowledge — notice problems early

Use a repeatable inspection routine. Check safety-critical components before travel, monitor instruments during the trip, and report defects afterward. Review visibility, space, speed, fatigue and cargo security in the official manual.

Study Section 2: Driving safely

Air brakes — understand the system

Learn how the compressor, governor, reservoirs, service brakes and spring brakes work together. Study pressure build-up, leakage checks and low-pressure warnings. Use the current manual and an instructor for exact test procedures and limits.

Study Section 5: Air brakes

Combination vehicles — coupling and turning

Study coupling security, air and electrical connections, trailer braking and turning space. Trailer wheels follow a different path from the tractor, so plan for offtracking. Learn the vehicle-specific coupling and inspection sequence with an instructor.

Study Section 6: Combination vehicles

Pre-trip inspection — explain what and why

Practice identifying each component, describing its condition and explaining the safety reason for checking it. Work through the official inspection section for your vehicle class. A general maintenance checklist does not replace the CDL inspection test requirements.

50 original APG practice questions

20 general knowledge, 10 air brakes, 10 combination vehicles and 10 inspection questions. Choose an answer before opening its explanation. This is an unofficial study bank, not an actual DMV exam or a passing-score prediction.

General knowledge · 20 questions

1. Why follow a consistent vehicle inspection sequence?

A. It allows you to skip unfamiliar components
B. It replaces the end-of-trip check
C. It reduces missed checks

Show answer and explanation

Answer: C. A repeatable routine makes it easier to check every safety item.

Review official DMV manual: Section 2

2. What should happen when an inspection reveals an unsafe defect?

A. Continue if dashboard warning lights are off
B. Repair the safety defect before operation
C. Record it and continue until the next scheduled service

Show answer and explanation

Answer: B. A working engine or clear dashboard does not make an unsafe vehicle roadworthy.

Review official DMV manual: Section 2

3. At highway speed, roughly how far ahead should you scan?

A. Only to the next vehicle
B. About 12–15 seconds of travel
C. One second of travel

Show answer and explanation

Answer: B. Looking well ahead gives time to recognize hazards and plan a response.

Review official DMV manual: Section 2

4. Why should you check mirrors regularly while driving?

A. To monitor traffic and the vehicle
B. To replace shoulder checks in every situation
C. To monitor only vehicles directly behind you

Show answer and explanation

Answer: A. Mirror checks help track nearby vehicles, clearances and developing problems.

Review official DMV manual: Section 2

5. For a hydraulic-brake vehicle, which distances make up total stopping distance?

A. Braking distance only
B. Perception, reaction and braking distances
C. Reaction and braking distances only

Show answer and explanation

Answer: B. Add perception, reaction and braking distances. Air-brake vehicles also have brake-lag distance.

Review official DMV manual: Section 2

6. When a road becomes slippery, what should you do?

A. Reduce speed and increase following space
B. Keep your usual speed but avoid mirrors
C. Follow closely so you can copy the vehicle ahead

Show answer and explanation

Answer: A. Reduced traction requires more room and smoother control inputs.

Review official DMV manual: Section 2

7. Why choose a safe speed and low gear before a steep downgrade?

A. To coast without engine braking
B. To use engine braking and reduce brake overheating
C. To select a gear only after speed builds

Show answer and explanation

Answer: B. Select the gear before descending; excessive service-brake use can overheat brakes.

Review official DMV manual: Section 2

8. Your vehicle is below the posted speed limit. Can that speed still be unsafe?

A. Only a posted advisory can require slowing
B. No, driving below the limit is always safe
C. Yes, conditions may require a lower speed

Show answer and explanation

Answer: C. Weather, visibility, traffic and vehicle loading can require slower travel.

Review official DMV manual: Section 2

9. What is the purpose of ABS during hard braking?

A. To guarantee a shorter stop on every surface
B. To help prevent wheel lockup and preserve control
C. To eliminate the need for extra following distance

Show answer and explanation

Answer: B. ABS helps control wheel lockup; it does not remove traction limits.

Review official DMV manual: Section 2

10. You become too sleepy to drive safely. What is the best response?

A. Use fresh air instead of taking a break
B. Rely on loud music to stay alert
C. Find a safe place to stop and rest

Show answer and explanation

Answer: C. Rest addresses fatigue; noise and fresh air are not reliable substitutes.

Review official DMV manual: Section 2

11. What should you do before backing when the space is uncertain?

A. Use only one mirror and keep moving
B. Get out and inspect the backing area
C. Assume the area is clear if it was clear earlier

Show answer and explanation

Answer: B. Check the surroundings and clearances before moving into an uncertain space.

Review official DMV manual: Section 2

12. With a helper guiding a backing maneuver, what if you lose sight of the helper?

A. Continue while watching the other mirror
B. Continue at the same speed until the helper returns
C. Stop the vehicle

Show answer and explanation

Answer: C. Stop when visual contact is lost; agree on signals before the maneuver.

Review official DMV manual: Section 2

13. Why inspect cargo securement before departure?

A. To prevent shifting or falling cargo
B. To avoid weighing the loaded vehicle
C. To eliminate all cargo inspections during the trip

Show answer and explanation

Answer: A. Cargo movement can affect stability and endanger people near the vehicle.

Review official DMV manual: Section 3

14. Can a legal total vehicle weight still include an overloaded axle?

A. No, correct tire pressure prevents axle overload
B. No, only total weight matters
C. Yes, axle weight limits also matter

Show answer and explanation

Answer: C. Total weight and the distribution of weight across axles must both be checked.

Review official DMV manual: Section 3

15. What generally happens when heavy cargo is stacked higher?

A. The vehicle becomes more stable in curves
B. The center of gravity rises and stability decreases
C. The center of gravity stays unchanged

Show answer and explanation

Answer: B. Keeping heavy loads low helps reduce rollover risk.

Review official DMV manual: Section 3

16. Who must ensure the cargo is safe even if someone else loaded it?

A. Only the loader has responsibility
B. Only the cargo owner has responsibility
C. The driver

Show answer and explanation

Answer: C. The driver remains responsible for safe loading and securement.

Review official DMV manual: Section 3

17. What is the normal first en-route cargo and securement check distance?

A. After 200 miles
B. Within the first 50 miles
C. Only at the delivery address

Show answer and explanation

Answer: B. The manual calls for an early recheck within 50 miles; specific sealed-load exceptions apply.

Review official DMV manual: Section 3

18. After that initial check, when should cargo securement generally be rechecked?

A. Only if the cargo is noisy
B. Once each calendar week
C. After driving 3 hours or 150 miles, and after each driving break

Show answer and explanation

Answer: C. Recheck after 3 hours or 150 miles, whichever comes first, and after breaks. Follow applicable cargo-inspection exceptions.

Review official DMV manual: Section 3

19. What should you do before moving an overlength or overwidth load?

A. Check required permits and route restrictions
B. Rely only on the vehicle’s total weight
C. Assume normal routes permit every oversized load

Show answer and explanation

Answer: A. Special loads may require permits, restricted routing and additional markings.

Review official DMV manual: Section 3

20. Why use blocking or bracing where appropriate?

A. To resist cargo movement
B. To allow cargo to slide freely
C. To replace every required tiedown

Show answer and explanation

Answer: A. Blocking and bracing help keep cargo in place; use appropriate securement for the load.

Review official DMV manual: Section 3

Air brakes · 10 questions

21. What supplies compressed air to the brake system?

A. The service brake chambers
B. The brake pedal return spring
C. The air compressor

Show answer and explanation

Answer: C. The compressor supplies air that is stored in the reservoirs.

Review official DMV manual: Section 5

22. What does the air-compressor governor control?

A. When the compressor pumps air or stops pumping
B. The pressure inside each tire
C. Trailer brake shoe clearance

Show answer and explanation

Answer: A. The governor responds to system pressure to control compressor pumping.

Review official DMV manual: Section 5

23. Why are air tanks drained as required?

A. To adjust the fifth-wheel height
B. To increase tire traction directly
C. To remove accumulated water and oil

Show answer and explanation

Answer: C. Moisture and oil can collect in reservoirs and cause brake-system problems.

Review official DMV manual: Section 5

24. What does a low-air-pressure warning indicate?

A. That tire inflation is below specification
B. Insufficient brake-system air pressure
C. That fuel pressure is below specification

Show answer and explanation

Answer: B. Stop safely as directed by the manual before pressure falls further.

Review official DMV manual: Section 5

25. What applies conventional spring brakes when air pressure is removed?

A. Engine oil pressure
B. Mechanical spring force
C. Gravity acting on the brake shoes

Show answer and explanation

Answer: B. Air holds the springs back; releasing that air lets spring force apply the brakes.

Review official DMV manual: Section 5

26. How can repeated unnecessary brake applications affect the air supply?

A. They cannot affect stored air pressure
B. They automatically fill the reservoirs faster
C. They can use air faster than it is replenished

Show answer and explanation

Answer: C. Repeated applications consume reservoir air and can reduce available pressure.

Review official DMV manual: Section 5

27. How does air-brake lag affect stopping?

A. It adds delay before the brakes take effect
B. It reduces stopping distance at higher speed
C. It cancels the driver’s reaction distance

Show answer and explanation

Answer: A. Air takes time to reach and actuate the brakes; allow for that delay.

Review official DMV manual: Section 5

28. What is brake fade on a long downgrade?

A. A harmless decrease in reservoir temperature
B. A normal loss of headlamp brightness
C. Reduced braking effectiveness from excessive heat

Show answer and explanation

Answer: C. Overheated brakes may provide much less stopping force.

Review official DMV manual: Section 5

29. What must you do before releasing parking brakes for an air-brake test?

A. Rely on neutral gear alone to prevent movement
B. Leave the vehicle unsecured if the engine is off
C. Secure the vehicle with wheel chocks as required

Show answer and explanation

Answer: C. Chocking prevents rolling during stationary brake-system checks.

Review official DMV manual: Section 5

30. If the ABS warning light remains on, what does that generally mean?

A. The ABS may be malfunctioning
B. The parking brakes must be engaged
C. The brake system has reached governor cut-out

Show answer and explanation

Answer: A. Check the system; normal braking can remain, but anti-lock assistance may be unavailable.

Review official DMV manual: Section 5

Combination vehicles · 10 questions

31. Why plan for trailer offtracking on turns?

A. Trailer wheels can track inside the tractor’s path
B. Trailer wheels always follow the exact front-wheel path
C. Offtracking occurs only while backing

Show answer and explanation

Answer: A. Allow clearance for the different path taken by the trailer wheels.

Review official DMV manual: Section 6

32. Which units are often most affected by rearward amplification?

A. Only the trailer immediately behind the tractor
B. Trailers farther back in the combination
C. Only the tractor’s front axle

Show answer and explanation

Answer: B. Abrupt steering can create a larger response at the rear of a combination.

Review official DMV manual: Section 6

33. Which behavior helps reduce rollover risk?

A. Entering a curve faster and braking midway
B. Slowing before curves and steering smoothly
C. Making quick corrections while in the curve

Show answer and explanation

Answer: B. High speed and sudden direction changes increase rollover risk.

Review official DMV manual: Section 6

34. What is the trailer hand valve primarily used for?

A. Testing trailer brakes
B. Parking the combination indefinitely
C. Correcting a jackknifing trailer while moving

Show answer and explanation

Answer: A. Use it to test trailer braking; it is not a parking brake.

Review official DMV manual: Section 6

35. Why should you avoid using the trailer hand valve to correct a trailer skid?

A. It can worsen a skid caused by locked trailer wheels
B. It always restores rear-wheel traction
C. It applies only the tractor brakes

Show answer and explanation

Answer: A. A trailer-wheel skid requires restoring traction, not adding brake lockup.

Review official DMV manual: Section 6

36. What do the service and emergency air lines carry?

A. Trailer supply air and brake-control air, respectively
B. Electrical current and compressed air, respectively
C. Brake-control air and trailer supply air, respectively

Show answer and explanation

Answer: C. The service line communicates braking demand; the emergency line supplies trailer air.

Review official DMV manual: Section 6

37. What is a glad hand?

A. An air-line coupling
B. A mechanical fifth-wheel locking jaw
C. A trailer support foot

Show answer and explanation

Answer: A. Glad hands connect tractor and trailer air lines with a sealing connection.

Review official DMV manual: Section 6

38. Why inspect glad-hand seals and connections?

A. To change the trailer’s axle weight rating
B. To prevent air leakage and improper connection
C. To lubricate the fifth-wheel plate

Show answer and explanation

Answer: B. Damaged seals or poor connections can compromise the air supply.

Review official DMV manual: Section 6

39. Where should fifth-wheel locking jaws engage?

A. Around the trailer’s landing-gear leg
B. Around the kingpin’s head only
C. Around the kingpin’s shank

Show answer and explanation

Answer: C. Inspect the locking mechanism to confirm proper engagement around the kingpin.

Review official DMV manual: Section 6

40. Should there be a visible gap between the upper and lower fifth-wheel plates after coupling?

A. Yes, a gap proves that the jaws are closed
B. No; check for proper contact
C. Yes, a gap is required for turning

Show answer and explanation

Answer: B. A gap can indicate improper coupling; inspect and correct it before travel.

Review official DMV manual: Section 6

Vehicle inspection · 10 questions

41. What should you explain during a CDL vehicle inspection test?

A. Only the name of each component
B. Only whether the engine starts
C. What you inspect, its condition and why it matters

Show answer and explanation

Answer: C. Show that you understand each checked component and its safety purpose.

Review official DMV manual: Section 11

42. What belongs in a tire inspection?

A. Inflation, tread and visible damage
B. Only the tire manufacturer’s name
C. Only whether the tread looks even

Show answer and explanation

Answer: A. Inspect for pressure problems, wear, cuts and other damage.

Review official DMV manual: Section 11

43. What can rust trails around wheel fasteners suggest?

A. Loose fasteners requiring attention
B. Normal brake-drum temperature
C. Correct wheel alignment

Show answer and explanation

Answer: A. Rust trails can indicate movement at a loose wheel nut.

Review official DMV manual: Section 11

44. What makes a steering linkage defect a safety concern?

A. It always indicates a low battery
B. It only affects steering-wheel appearance
C. Loose or damaged parts can affect directional control

Show answer and explanation

Answer: C. Check steering components for secure mounting, damage and missing hardware.

Review official DMV manual: Section 11

45. What should you check on suspension components?

A. Damage, missing parts, secure mounting and leaks where applicable
B. Only the axle paint condition
C. Only the age of the tires

Show answer and explanation

Answer: A. The suspension supports the load and helps keep axles properly located.

Review official DMV manual: Section 11

46. What is important when inspecting hoses and belts?

A. Only whether the hose looks clean
B. Condition, secure connections and proper tension where applicable
C. Only whether the belt turns when running

Show answer and explanation

Answer: B. Look for wear, damage and leaks; belt tension must meet the vehicle’s requirements.

Review official DMV manual: Section 11

47. What should a lights and reflectors check establish?

A. Headlights alone are working
B. All lamps are the same size
C. Required lights function and lenses/reflectors are clean and sound

Show answer and explanation

Answer: C. Visibility and signaling depend on working lights and intact, clean reflectors.

Review official DMV manual: Section 11

48. Why check mirrors and windshield condition?

A. To maintain clear visibility
B. To establish the cargo’s weight
C. To replace checks of blind spots

Show answer and explanation

Answer: A. Damage, dirt or obstructions can interfere with seeing traffic and hazards.

Review official DMV manual: Section 11

49. What should you check about a trailer’s electrical and air lines?

A. That the lines are stretched tight in turns
B. That air and electrical lines can be swapped
C. Secure connection, condition and safe routing

Show answer and explanation

Answer: C. Lines should be connected securely and protected from damage, tangling and dragging.

Review official DMV manual: Section 11

50. Why inspect brake hoses, drums and linings where accessible?

A. To replace a check of brake operation
B. To determine whether the vehicle needs washing
C. To identify damage, leaks, wear or contamination

Show answer and explanation

Answer: C. Brake component defects can impair stopping and must be addressed.

Review official DMV manual: Section 11

Official sources checked October 13, 2026. Always consult the DMV’s current manual and requirements before testing.