Class A Driver's License Practice Test -3 — Questions and Answers

Question 1: As a commercial driver, when should you wear seat belts?

Any time you are operating a moving vehicle. (Correct answer)
Only when you are travelling on a highway.
Only when transporting agricultural products.
Only in states where it is required by law.

Correct answer: Any time you are operating a moving vehicle.

Commercial drivers are legally required by federal regulations to wear seat belts whenever operating a moving vehicle. Seat belts are a primary safety device that significantly reduces the risk of injury or fatality in a crash by keeping the driver securely in place. This rule applies universally, regardless of the road type or cargo being transported.

Question 2: You will be denied or lose your hazardous materials endorsement, if you _______.

All of the listed answers. (Correct answer)
If you are under indictment for certain felonies.
Have a conviction in military or civilian court for certain felonies.
Have been committed to a mental institution.

Correct answer: All of the listed answers.

A hazardous materials endorsement (HME) is subject to strict security requirements due to the inherent risks of transporting dangerous goods. Drivers will be denied or lose their HME if they have certain felony convictions (military or civilian), are under indictment for specific felonies, or have been committed to a mental institution. These measures ensure only responsible individuals handle hazardous materials.

Question 3: If you have committed three serious traffic violations within a three-year period involving a CMV, you will likely lose your CDL at least _______ days.

90
60
120 (Correct answer)
45
30

Correct answer: 120

Commercial drivers face severe penalties for serious traffic violations. Committing three serious traffic violations within a three-year period while operating a Commercial Motor Vehicle (CMV) results in a mandatory disqualification of at least 120 days. This penalty is designed to enforce safe driving practices and maintain public safety on the roads.

Question 4: Which of the following is a serious traffic violation?

Erratic lane changes.
Following a vehicle too closely.
All of the listed answers. (Correct answer)
Excessive speeding (15 mph or more above the posted limit).
Reckless driving.

Correct answer: All of the listed answers.

Serious traffic violations for CDL holders carry significant consequences due to their potential to cause accidents. Erratic lane changes, following a vehicle too closely, excessive speeding (15 mph or more above the posted limit), and reckless driving are all classified as serious violations. Accumulating these can lead to CDL suspension or revocation, emphasizing the importance of safe and responsible driving.

Question 5: You will lose your CDL for at least ____ days if you have committed your first violation of an out-of-service order.

45
90 (Correct answer)
30
60

Correct answer: 90

A first violation of an out-of-service order for a CDL holder results in a mandatory disqualification period. This specific regulation is designed to enforce safety compliance and ensure drivers adhere to critical safety directives. The penalty for a first offense is a suspension of at least 90 days, emphasizing the seriousness of violating these orders.

Question 6: While driving a large vehicle, it is often difficult to see whether a vehicle is close behind you. Which of the following is a common reason someone may tailgate a driver of a large vehicle?

Bad weather.
The driver of the large vehicle is maintaining the speed limit.
Bad weather or if the driver of the large vehicle is travelling too slowly. (Correct answer)
The driver of the large vehicle is travelling too slowly.
Sunny weather.

Correct answer: Bad weather or if the driver of the large vehicle is travelling too slowly.

Tailgating a large vehicle is dangerous and often occurs due to specific driving conditions or driver behavior. Drivers may tailgate in bad weather because visibility is reduced, making them feel they need to be closer to see the vehicle ahead. Additionally, if the large vehicle is traveling too slowly for the tailgater's preference, they might follow too closely out of impatience, increasing the risk of a collision.

Question 7: On the CDL pre-trip vehicle inspection test, you can expect to ________.

To explain why you want a commercial driver's license.
To be asked to explain to the examiner what parts of your vehicle you would inspect and why. (Correct answer)
To answer general CDL questions.
To park your school bus.

Correct answer: To be asked to explain to the examiner what parts of your vehicle you would inspect and why.

The CDL pre-trip vehicle inspection test assesses a driver's ability to identify and explain critical vehicle components and their proper functioning. You are expected to demonstrate your knowledge by explaining what parts you would inspect and why they are important for safe operation. This ensures you can detect potential mechanical issues before driving, which is crucial for commercial vehicle safety.

Question 8: Crossbuck signs require you to ______.

Yield the right-of-way. (Correct answer)
Turn off your engine.
Accelerate your vehicle.
Honk your horn.

Correct answer: Yield the right-of-way.

Crossbuck signs are found at railroad crossings and indicate that a train may be approaching. Unlike stop signs, they do not always require a complete stop, but they always demand that you yield the right-of-way to any approaching train. Drivers must slow down, look, and listen for trains, proceeding only when it is safe to do so.

Question 9: If the oil pressure is low, dropping or fluctuating, you should _____.

Honk your horn to warn other drivers.
Stop immediately. (Correct answer)
None of the listed answers.
Accelerate and reach your destination as quickly as possible.

Correct answer: Stop immediately.

Low, dropping, or fluctuating oil pressure is a critical warning sign that indicates a severe problem with your engine's lubrication system. Continuing to drive with insufficient oil pressure can lead to catastrophic engine damage, as vital moving parts will not be properly lubricated. Therefore, stopping immediately is essential to prevent further damage and ensure safety.

Question 10: If you are driving a 40 ft. vehicle at 35 mph, you should leave how many seconds between you and the vehicle ahead?

3 seconds.
5 seconds.
4 seconds. (Correct answer)
7 seconds.

Correct answer: 4 seconds.

The general rule for following distance in a commercial vehicle is one second for every 10 feet of vehicle length, plus an additional second for speeds over 40 mph. For a 40-foot vehicle, this means 4 seconds. Since the speed is 35 mph (not over 40 mph), the base rule applies, requiring a minimum of 4 seconds of following distance to allow for safe stopping.

Question 11: Overloading your vehicle can have bad effects on your ________.

Speed control.
All of the listed answers. (Correct answer)
Steering.
Braking.

Correct answer: All of the listed answers.

Overloading a vehicle significantly compromises its safety and performance. It negatively impacts braking effectiveness, making it harder to stop. It also affects steering control, making the vehicle less responsive and more difficult to maneuver. Furthermore, overloading can impair speed control, especially on grades, and strain other vehicle components, increasing the risk of mechanical failure.

Question 12: What is the purpose of a front-end header board?

Protects your eyes from the sun.
Helps you rock out in your car during traffic jams.
Protects you from your cargo in case of a crash or emergency stop. (Correct answer)
Details important information about your vehicle's gross weight and the cargo's hazard class if applicable.

Correct answer: Protects you from your cargo in case of a crash or emergency stop.

A front-end header board, also known as a headache rack, is a crucial safety device installed at the front of a flatbed trailer or truck bed. Its primary purpose is to protect the driver and cab from shifting cargo during sudden stops, collisions, or emergency braking. It acts as a barrier, preventing the load from sliding forward into the driver's compartment.

Question 13: No matter how small the cargo you are transporting, it's a good idea to have at least ___ tie-downs holding it.

4
7
3
2 (Correct answer)

Correct answer: 2

Even for small pieces of cargo, it is a good practice to use at least two tie-downs. This ensures that the cargo is secured against movement in multiple directions, preventing it from shifting, falling, or becoming a hazard. Using two tie-downs provides redundancy and better stability compared to a single tie-down.

Question 14: A high center of gravity means _______.

Much of the load's weight is carried high up off the road. (Correct answer)
Much of the load's weight is carried low off the road.
The vehicle is very heavy.
None of the listed answers.

Correct answer: Much of the load's weight is carried high up off the road.

A high center of gravity means that a significant portion of the load's weight is positioned high up off the road surface. This characteristic makes a vehicle less stable and more prone to rollovers, especially when turning or on uneven terrain. Understanding this concept is crucial for safe loading and driving of commercial vehicles.

Question 15: Generally, how many tiedowns should you aim to have for each 10 ft. of cargo?

5
1 (Correct answer)
3
4

Correct answer: 1

Federal regulations generally require at least one tiedown for every 10 feet of cargo length. This guideline ensures that cargo is adequately secured along its entire length, preventing shifting or dislodging during transit. For shorter cargo, a minimum of two tiedowns is still recommended for stability.

Question 16: Which of the following is a necessary step to test your service brakes?

Release the parking brake.
Move the vehicle forward slowly.
All of the listed answers. (Correct answer)
Wait for normal air pressure.

Correct answer: All of the listed answers.

Testing your service brakes involves several critical steps to ensure they are functioning correctly. You must first wait for normal air pressure to build up, then release the parking brake. Finally, move the vehicle forward slowly and apply the brakes to check for proper stopping action, ensuring the vehicle stops smoothly and in a straight line.

Question 17: Why should air tanks be drained completely?

To expel surplus air.
Because compressed air typically consists of water and some oil, which can be bad for the air brake system. (Correct answer)
None of the listed answers.
Air tanks should not be drained completely.

Correct answer: Because compressed air typically consists of water and some oil, which can be bad for the air brake system.

Air tanks in a commercial vehicle's air brake system must be drained regularly because compressed air naturally contains water vapor and some oil. Over time, these contaminants accumulate in the tanks. If not drained, this water and oil can freeze in cold weather, corrode components, or interfere with the proper operation of the air brake system, leading to brake failure.

Question 18: When increased application pressure to maintain the same speed becomes necessary, you should ______.

Notify the police.
Slow down and use a lower gear. (Correct answer)
Use a lower gear.
Slow down.
Accelerate the vehicle.

Correct answer: Slow down and use a lower gear.

If you find that you need to apply more pressure to your accelerator pedal to maintain the same speed, it often indicates that your engine is struggling or that you are in too high a gear for the current conditions, especially on an upgrade. To prevent engine strain and maintain control, you should slow down and shift into a lower gear. This allows the engine to operate more efficiently and provides better control over the vehicle's speed.

Question 19: Modern air brake systems are made up of service brake systems, parking brake systems and what other brake system?

Emergency brake system. (Correct answer)
S-cam brakes.
Drum brakes.
None of the listed answers.

Correct answer: Emergency brake system.

The tractor protection valve is a vital component in a combination vehicle's air brake system. Its primary function is to seal off the air supply to the trailer if the trailer breaks away or develops a severe air leak. This ensures that the tractor's air brake system retains sufficient air pressure to allow the driver to stop the tractor safely.

Question 20: Continued overuse of brakes that are fading may result in ________.

A broken low air pressure warning signal.
Low self-esteem.
The vehicle being unable to stop. (Correct answer)
Nothing.

Correct answer: The vehicle being unable to stop.

Continued overuse of brakes that are fading may result in the vehicle being unable to stop. [Page, 5--9. 5.4.5- Brake Fading or Failure, 5.4- Using Air Brakes, Section 5: Air Brakes, CDL]

Question 21: The tractor protection valve ______.

Keeps air in the tractor or truck brake system should the trailer break away or develop a bad leak. (Correct answer)
Helps driver maintain speed of the truck.
Protects the driver.
None of the listed answers.

Correct answer: Keeps air in the tractor or truck brake system should the trailer break away or develop a bad leak.

The tractor protection valve keeps air in the tractor or truck brake system should the trailer break away or develop a bad leak. [Page, 6--4, 6--5. 6.2.2- Tractor Protection Valve, 6.2- Combination Vehicle Air Brakes, Section 6: Combination Vehicles, CDL]

Question 22: What could happen if you make a sudden movement while driving a tractor-trailer?

Your trailer could tip over. (Correct answer)
Your brakes could stop working.
None of the listed answers.
You wheel could lock up.

Correct answer: Your trailer could tip over.

Tractor-trailers have a high center of gravity and are long, making them susceptible to instability. Sudden movements, such as sharp turns or abrupt lane changes, can cause the trailer to swing wide or even tip over, especially if the cargo is not properly secured or is top-heavy. Smooth and controlled driving is essential to prevent such dangerous incidents.

Question 23: You are testing the stopping action of service brakes on a hydraulic system. Which of the following may indicate that there is a problem with your service brakes?

Stopping action is delayed.
All of the listed answers. (Correct answer)
The brake pedal goes to the floor.
The vehicle pulls to one side when the brake pedal is pressed.

Correct answer: All of the listed answers.

When testing hydraulic service brakes, several issues can indicate a problem. If the brake pedal goes to the floor, it suggests a loss of hydraulic fluid or a major leak. If the vehicle pulls to one side when braking, it could mean uneven brake adjustment or a problem with a specific brake unit. A delayed stopping action indicates a general issue with brake effectiveness, all of which require immediate attention.

Question 24: What type of vehicles are more likely to off-track?

Shorter vehicles.
Taxi cabs.
Longer vehicles. (Correct answer)

Correct answer: Longer vehicles.

Off-tracking is the phenomenon where the rear wheels of a vehicle follow a different path than the front wheels, especially during turns. Longer vehicles, such as tractor-trailers and buses, exhibit more significant off-tracking because of their extended wheelbase. Drivers of longer vehicles must account for off-tracking to avoid hitting curbs, other vehicles, or objects when turning.

Question 25: Dead end couplers prevent water and dirt entering into the and the __.

The coupler, oil tank
Safety chamber, oil tank.
The air lines, the safety chamber
The couplers, air lines. (Correct answer)

Correct answer: The couplers, air lines.

Dead end couplers, also known as dummy couplers or gladhand holders, are used to store the air lines (service and emergency) when they are disconnected from a trailer. Their purpose is to prevent water, dirt, and other contaminants from entering the air lines and potentially damaging the air brake system. Keeping the air lines clean is crucial for the proper functioning of the brakes.

Question 26: All versions of the Class A Pre-trip inspection test will include _______.

An engine start.
All of the listed answers. (Correct answer)
An in-cab inspection.
An inspection of the coupling system.

Correct answer: All of the listed answers.

The Class A Pre-trip inspection test is comprehensive and designed to ensure a driver can safely operate a combination vehicle. It always includes an engine start to check gauges and warning lights, an in-cab inspection to verify controls and safety equipment, and a thorough inspection of the coupling system to ensure the tractor and trailer are securely connected and functioning correctly.

Question 27: You must check that the ____ do not have cracks or frays.

Alternator belt.
Air compressor belt.
Water pump belt.
All of the listed answers. (Correct answer)
Power steering belt.

Correct answer: All of the listed answers.

During a pre-trip inspection, it is essential to check all belts for cracks or frays. This includes the alternator belt, air compressor belt, water pump belt, and power steering belt. These belts drive critical engine components, and if any of them are damaged or broken, it can lead to immediate loss of power to essential systems, potentially causing a breakdown or loss of control.

Question 28: If your vehicle's landing gear is power-operated, you will need to check for ______.

Air or hydraulic leaks. (Correct answer)
None of the listed answers.
Water
Oil on the ground.

Correct answer: Air or hydraulic leaks.

If your vehicle's landing gear is power-operated, it typically uses either an air or hydraulic system. During your pre-trip inspection, you must check for any signs of air or hydraulic leaks. Leaks can indicate a malfunction in the system, which could prevent the landing gear from operating correctly or lead to a loss of pressure in other critical systems.

Question 29: If your fifth wheel plate is not well lubricated, this could cause ___________.

None of the listed answers.
Less air to reach the emergency line.
Steering problems. (Correct answer)
Nothing.

Correct answer: Steering problems.

Proper lubrication of the fifth wheel plate is crucial for safe and efficient operation of a tractor-trailer. If the fifth wheel plate is not well lubricated, it can create excessive friction between the tractor and trailer. This friction can lead to steering problems, making it harder to turn and increasing wear on components, potentially causing dangerous handling issues.

Question 30: What emergency equipment should your vehicle have?

Spare electrical fuses.
Fire extinguisher.
Warning devices for parked vehicles.
All of the listed answers. (Correct answer)

Correct answer: All of the listed answers.

CDL regulations mandate that commercial vehicles carry specific emergency equipment for safety. This includes spare electrical fuses for quick repairs, a fire extinguisher for potential fires, and warning devices (like reflective triangles) to alert others if the vehicle is stopped. All these items are crucial for ensuring driver and public safety on the road.

Class A Driver's License Practice Test -3

As a commercial driver, when should you wear seat belts?