Arizona CDL Combination Practice Test (AZ) 2

4.9 out of 5 (61 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Prepare yourself thoroughly for the AZ CDL combination test with our comprehensive Arizona CDL combination practice test. This invaluable resource is designed to help you master the critical skills and knowledge needed to excel. Featuring 20 multiple-choice questions, our test covers vital topics such as inspection procedures, safe driving practices, and air brake systems. To pass, you'll need to answer at least 16 questions correctly, ensuring you have a solid grasp of the material. One of the unique challenges of driving in AZ is the diverse range of conditions you may encounter. From the scorching heat of the desert in Phoenix to the snow-covered roads in Flagstaff, being well-prepared for any scenario is crucial. Our Arizona combination CDL practice test emphasizes key safety areas, including the dangers of jackknifing, which is particularly relevant when navigating AZ's varied terrain. Understanding how to prevent this hazardous situation through smooth braking and careful handling will significantly enhance your driving safety. The flexibility of our Arizona practice permit test means you can study whenever it suits you best, day or night. This online resource is available 24/7, allowing you to fit your preparation around your schedule. Additionally, our drivers permit practice test comes equipped with a range of study aids to help you succeed. If you encounter a difficult question, you can request a hint to guide you towards the correct answer. Should you answer incorrectly, a detailed explanation will be provided to help you understand the material better. Our AZ CDL combination practice test is specifically tailored to the endorsement, focusing solely on questions that you will encounter on the actual permit test. This targeted approach ensures you are studying the most relevant material. Remember, to obtain a commercial driver's license, you must also pass the general knowledge test. If you need to prepare for this, we offer comprehensive general knowledge prep tests as well. By using our Arizona combination CDL practice test, you are setting yourself up for success. Boost your confidence, refine your skills, and ensure you are fully prepared for the real test. Start practicing today and take the first step towards earning your commercial driver's license.
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Sample Arizona Combination Test Questions

Question 1

What adjustment should you make if the semitrailer is too high for proper fifth-wheel coupling?

  1. A Raise the trailer farther
  2. B Back under it at a higher speed
  3. C Approach the trailer at an angle
  4. D Lower the trailer

Correct answer: D – Lower the trailer

Lower the trailer until the fifth wheel will contact the trailer apron and raise it slightly as the tractor backs under. If the trailer remains too high, the kingpin may not enter and lock into the fifth wheel correctly. Use the landing gear to make the required adjustment before coupling.

Source: Arizona Commercial Driver License Manual — § 6.4.1, “Step 6. Check Trailer Height”

Question 2

Compared with an empty rig, a fully loaded combination vehicle is about ten times more likely to roll over in a crash.

  1. A True
  2. B False

Correct answer: A – True

The CDL manual states that fully loaded rigs are ten times more likely to roll over in a crash than empty rigs. Cargo raises the vehicle's center of gravity, particularly when it is stacked high. Keeping cargo low and slowing before turns help reduce rollover risk.

Source: Arizona Commercial Driver License Manual — § 6.1.1, “Rollover Risks”

Question 3

Why is the trailer hand valve the wrong response to a trailer jackknife?

  1. A The hand valve cannot operate the trailer brakes
  2. B The trailer-wheel braking that locked the wheels caused the skid
  3. C The hand-valve control cannot be reached during a skid
  4. D The hand valve should be used to pull the trailer straight

Correct answer: B – The trailer-wheel braking that locked the wheels caused the skid

A trailer jackknife begins when locked trailer wheels lose traction and the trailer swings outward. Applying the hand valve adds braking to the wheels that caused the skid. Release the brakes to restore traction; when the trailer wheels grip the road again, the trailer should begin following the tractor and straightening out.

Source: Arizona Commercial Driver License Manual — § 6.1.5, “Prevent Trailer Skids”

Question 4

Why does a bobtail tractor require extra caution while braking?

  1. A Its steering system becomes inoperative without a trailer
  2. B It has less traction, locks its wheels easily, and may take longer to stop
  3. C Its engine consumes substantially more fuel
  4. D It always has a higher center of gravity than a loaded combination

Correct answer: B – It has less traction, locks its wheels easily, and may take longer to stop

A bobtail tractor has little weight over its drive axles compared with a loaded combination. Its stiff suspension and strong brakes can provide poor traction and make wheel lockup easier. Testing cited in the CDL manual found that a bobtail can take longer to stop than a tractor-semitrailer loaded to maximum gross weight.

Source: Arizona Commercial Driver License Manual — § 6.1.3, “Brake Early”

Question 5

If the trailer wheels lock and begin to skid during braking, what action helps restore traction?

  1. A Accelerate immediately
  2. B Make a sharp steering movement
  3. C Apply the trailer hand valve
  4. D Release the brakes

Correct answer: D – Release the brakes

Locked trailer wheels tend to make the trailer swing outward. After recognizing the skid in the mirrors, release the brakes to regain traction rather than applying the trailer hand valve. Once the wheels grip the road again, the trailer should begin following the tractor and straighten out.

Source: Arizona Commercial Driver License Manual — § 6.1.5, “Prevent Trailer Skids”

Question 6

Why should the trailer hand valve not be used to park a trailer without spring brakes?

  1. A Stored air can leak away and release the brakes
  2. B The valve can damage the trailer tires
  3. C The valve permanently drains the tractor's air tanks
  4. D The valve prevents the fifth wheel from coupling

Correct answer: A – Stored air can leak away and release the brakes

The hand valve uses air pressure to apply the trailer service brakes. On a trailer without spring brakes, stored air may eventually leak away and allow the brakes to release. Use the proper vehicle parking brakes when available, and chock the trailer wheels if the trailer does not have spring brakes.

Source: Arizona Commercial Driver License Manual — § 6.2.1, “Trailer Hand Valve”, Arizona Commercial Driver License Manual — § 6.2.8, “Trailer Service, Parking and Emergency Brakes”

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