Massachusetts CDL Combination Practice Test (MA) 2

4.9 out of 5 (55 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Enhance your preparation for the MA CDL with our comprehensive Massachusetts RMV practice test, tailored specifically to help you master the skills required for your combination CDL. This MA learner's permit practice test features 20 multiple-choice questions that cover essential topics such as inspection procedures, safe driving practices, air brake systems, and more. To pass, you'll need to correctly answer at least 16 questions, giving you a solid foundation for the permit test. Our Massachusetts combination vehicle test is completely free, offering the same valuable features and study opportunities as any paid counterpart. Updated for 2026, our practice test ensures that you're studying the most current driving laws and regulations, making your preparation as relevant as possible. By regularly updating our practice tests, we ensure that you're getting the freshest information available. The MA combination CDL practice test incorporates real-life driving scenarios to help you become a safer driver. For instance, you'll encounter questions about the dangers of jackknifing, a situation where the trailer swings out of alignment with the tractor. Learning to avoid this through smooth braking and careful handling is crucial for maintaining safety on the road. By engaging with these realistic scenarios, you'll be better prepared not only for the written permit test but for your future on the road. Massachusetts' unique driving conditions, from the bustling streets of Boston to the scenic but narrow roads of the Berkshires, require specialized knowledge and careful driving practices. This practice permit test takes these local conditions into account, helping you understand how to navigate the diverse terrains and traffic patterns found throughout the state. Whether you're dealing with the winter snow in Worcester or the coastal fog in Cape Cod, our CDL combination test prepares you for the real-world challenges you'll face. By using our MA combination CDL practice test, you're setting yourself up for success. Build your confidence, enhance your knowledge, and ensure you're fully prepared for the Massachusetts permit test. Start today and take the first step towards obtaining your CDL with our expertly designed practice tests.
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Sample Massachusetts Combination Test Questions

Question 1

Which trailer air line carries pressure controlled by the foot brake?

  1. A The emergency or supply line
  2. B The service or control line
  3. C The shut-off valve
  4. D The glad-hand seal

Correct answer: B – The service or control line

The service air line carries the signal that applies the trailer’s service brakes. Its pressure changes according to how firmly the driver presses the foot brake or operates the trailer hand valve. The emergency line has different functions: it supplies the trailer air tanks and controls the trailer emergency brakes when pressure is lost.

Source: Massachusetts CDL Manual – March 2025 Version — § 6.2.4, “Trailer Air-lines”

Question 2

A truck tractor is pulling a trailer that blocks any view through an interior mirror. Which rear-vision mirrors are required?

  1. A Two outside mirrors, one on each side
  2. B One outside mirror on the driver’s side only
  3. C One outside mirror on the passenger’s side only
  4. D No mirrors if the tractor has a rear camera

Correct answer: A – Two outside mirrors, one on each side

Federal motor-carrier equipment rules generally require a bus, truck, or truck tractor to have an outside rear-vision mirror on each side. A driver-side-only exception applies to certain trucks with a usable interior view to the rear, which a blocking trailer prevents. Massachusetts incorporates these Part 393 equipment requirements for covered commercial vehicles.

Source: 49 CFR § 393.80(a), (b)(2) – Rear-Vision Mirrors, 540 CMR 14.03 – Adoption and Incorporation of Federal Regulations as State Regulations

Question 3

According to the CDL manual, a fully loaded rig is how many times more likely to roll over in a crash than an empty rig?

  1. A Two times
  2. B Three times
  3. C Five times
  4. D Ten times

Correct answer: D – Ten times

The Massachusetts CDL manual states that fully loaded rigs are ten times more likely to roll over in a crash than empty rigs. Adding cargo can raise the vehicle’s center of gravity, making it easier to overturn. Cargo should be kept low and centered, and the driver must reduce speed before turns and curves.

Source: Massachusetts CDL Manual – March 2025 Version — § 6.1.1, “Rollover Risks”

Question 4

After a tractor and semitrailer are correctly coupled, how much space should remain between the trailer’s upper plate and the fifth wheel?

  1. A One to two inches
  2. B Two to five inches
  3. C At least five inches
  4. D No space

Correct answer: D – No space

There should be no space between the upper and lower fifth-wheel surfaces. A gap may indicate that the kingpin is sitting on top of the closed jaws rather than being securely captured. Inspect underneath to confirm that the jaws surround the kingpin shank and that the locking lever and safety latch are properly positioned.

Source: Massachusetts CDL Manual – March 2025 Version — § 6.4.1, “Coupling Tractor-Semitrailers—Step 13: Inspect Coupling”

Question 5

Before backing the tractor under a semitrailer, which condition must you verify?

  1. A The tractor protection valve is disconnected
  2. B All air brakes are released
  3. C The trailer landing gear is fully raised
  4. D The trailer brakes are locked

Correct answer: D – The trailer brakes are locked

Before backing under the trailer, make sure normal air pressure has been reached and lock the trailer brakes. This is done by pulling out the trailer air-supply knob or moving an older tractor protection control to the emergency position. The tractor should then be backed slowly and straight beneath the trailer.

Source: Massachusetts CDL Manual – March 2025 Version — § 6.4.1, “Coupling Tractor-Semitrailers—Steps 9–10”

Question 6

After connecting and charging the trailer air lines, how can you check that the trailer brakes apply and release?

  1. A Accelerate quickly while watching the gauges
  2. B Apply and release the brakes while listening for brake movement and escaping air
  3. C Check only the rearview mirrors
  4. D Turn the steering wheel from lock to lock

Correct answer: B – Apply and release the brakes while listening for brake movement and escaping air

Shut off the engine so the brake sounds can be heard clearly. Apply and release the trailer brakes; you should hear the brakes move when applied and air escape when released. Also watch the air-pressure gauge for signs of a major air loss before proceeding with the coupling process.

Source: Massachusetts CDL Manual – March 2025 Version — § 6.4.1, “Coupling Tractor-Semitrailers—Step 8: Supply Air to Trailer”

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