CDL CLASS A COMMERCIAL DRIVER'S LICENSE PRACTICE TEST — Questions and Answers

Question 1: What offense is a serious traffic violation?

Following a vehicle too closely.
Traffic offenses committed in a CMV in connection with fatal traffic accidents.
Erratic lane changes.
Reckless driving.
All of the listed answers. (Correct answer)

Correct answer: All of the listed answers.

All the listed actions—reckless driving, erratic lane changes, following a vehicle too closely, and traffic offenses committed in a CMV in connection with fatal traffic accidents—are considered serious traffic violations for CDL holders. Accumulating multiple serious violations can lead to disqualification from operating a Commercial Motor Vehicle (CMV). These violations indicate a disregard for safety and can result in severe penalties.

Question 2: The Motor Carrier Safety Improvement Act of 1999 requires _________.

CDL holders refrain from driving personal vehicles.
Requires a CDL holder to be disqualified from operating a commercial motor vehicle if the CDL holder has been convicted of certain types of moving violations in their personal vehicle. (Correct answer)
Operators of commercial motor vehicles to take an additional skills test.
None of the listed answers.

Correct answer: Requires a CDL holder to be disqualified from operating a commercial motor vehicle if the CDL holder has been convicted of certain types of moving violations in their personal vehicle.

The Motor Carrier Safety Improvement Act of 1999 was enacted to enhance highway safety by holding CDL holders to a higher standard. It requires that a CDL holder be disqualified from operating a commercial motor vehicle if they are convicted of certain serious moving violations, even when driving their personal vehicle. This ensures that drivers maintain a safe driving record regardless of the vehicle type they are operating.

Question 3: If you have committed your first violation of an out-of-service order, you will likely lose your CDL for ____ days.

90
60
180 (Correct answer)
30

Correct answer: 180

Violating an out-of-service order is a serious offense for a CDL holder, as these orders are issued to prevent unsafe vehicle operation. For a first conviction of violating an out-of-service order, a CDL holder will typically be disqualified from operating a commercial motor vehicle for 180 days. This penalty is designed to deter drivers from operating vehicles that have been deemed unsafe.

Question 4: When should you notify your employer if your license is suspended?

Within two business days. (Correct answer)
Only when asked.
After a month.
Never.

Correct answer: Within two business days.

CDL regulations mandate that drivers must promptly inform their employer if their license is suspended, revoked, or canceled. This notification must occur within two business days of receiving the notice of suspension. This ensures employers are aware of their drivers' legal status and can prevent them from operating a commercial motor vehicle illegally, maintaining compliance and safety.

Question 5: If you are convicted in any other jurisdiction of any traffic violation (except parking), you need to notify the motor vehicle licensing agency within how many days?

60 days.
120 days.
90 days.
30 days. (Correct answer)

Correct answer: 30 days.

Commercial drivers are required to notify their state's motor vehicle licensing agency of any traffic violation conviction (except parking) received in any jurisdiction, including other states or countries. This notification must be made within 30 days of the conviction. This ensures that the driver's complete driving record is maintained and accessible, upholding safety standards for CDL holders.

Question 6: Which of the following is a basic step that you should take at the scene of an accident?

Protecting the area.
All of the listed answers. (Correct answer)
Notifying the authorities.
Caring for the injured.

Correct answer: All of the listed answers.

At the scene of an accident, commercial drivers have several critical responsibilities to ensure safety and proper procedure. These include protecting the area from further hazards (e.g., setting out warning devices), caring for any injured individuals by providing first aid and calling for medical help, and notifying the appropriate authorities (police, fire, EMS) as soon as possible. Taking all these steps is crucial for managing the situation effectively and safely.

Question 7: Partly engaging the clutch before you take your right foot off the brake is particularly important for vehicles that have ______.

This is never important.
Automatic transmission.
None of the listed answers.
Manual transmission. (Correct answer)

Correct answer: Manual transmission.

For vehicles with manual transmissions, partly engaging the clutch (finding the friction point) before fully releasing the brake is a crucial technique. This is particularly important on inclines or when maneuvering slowly, as it prevents the vehicle from rolling backward or stalling. It allows for a smooth transition from braking to acceleration, maintaining control and preventing unexpected movement.

Question 8: ______ can be a hazard for commercial drivers.

Distracted drivers.
Pedestrians chatting.
Joggers wearing head phones.
Joggers wearing head phones.
All of the listed answers. (Correct answer)

Correct answer: All of the listed answers.

Commercial drivers face numerous hazards on the road, and many involve other road users. Distracted drivers, pedestrians, and joggers (especially those wearing headphones who may not hear approaching vehicles) all pose risks due to their unpredictable actions. These situations require commercial drivers to be constantly vigilant and practice defensive driving to prevent accidents.

Question 9: As part of your pre-trip vehicle inspect test, you should look under the vehicle for ______.

Coolant.
Fuel leaks.
All of the listed answers. (Correct answer)
Fresh oil.
Grease

Correct answer: All of the listed answers.

During a pre-trip vehicle inspection, it is essential to thoroughly check under the vehicle for any signs of leaks. Fresh oil, coolant, fuel, and grease leaks can indicate serious mechanical problems that could lead to breakdowns or safety hazards. Identifying these leaks before starting a trip allows for timely repairs and prevents potential issues on the road.

Question 10: What is the proper way to test your hydraulic brakes for leaks?

Pump the brake pedal three times. Then apply firm pressure to the pedal and hold for five seconds. The pedal should not move. (Correct answer)
Check for normal air pressure, release the parking brakes and move the vehicle forward slowly. Apply the trailer brakes with the hand control, if so equipped. You should be able to feel the brakes come on.
There is no way to test if your hydraulic brakes are working.
None of the listed answers.

Correct answer: Pump the brake pedal three times. Then apply firm pressure to the pedal and hold for five seconds. The pedal should not move.

To properly test hydraulic brakes for leaks, pump the brake pedal three times to build pressure within the system. Then, apply firm pressure to the pedal and hold it for five seconds. If the hydraulic system is sound and free of leaks, the pedal should not move or sink during this time; a sinking pedal indicates a leak or other issue requiring immediate attention.

Question 11: Who is responsible for making sure the vehicle is not overloaded with cargo?

You, the driver. (Correct answer)
Your employer.
The shipper.
Your mom.

Correct answer: You, the driver.

As the commercial driver, you are ultimately responsible for ensuring that your vehicle is not overloaded with cargo. This includes checking weight limits for the vehicle, axles, and tires to comply with legal regulations and safety standards. Overloading can lead to unsafe handling, increased stopping distances, tire failure, and legal penalties, making it a critical responsibility.

Question 12: What is the tire load?

The tire's quality rating.
The tire's full weight.
Specifies the contents of your tire.
The tire load is the maximum safe weight a tire can carry at a specified pressure. (Correct answer)

Correct answer: The tire load is the maximum safe weight a tire can carry at a specified pressure.

The tire load is the maximum safe weight a tire can carry at a specified pressure, typically indicated by a load index on the tire's sidewall. This rating is crucial for safe vehicle operation, as exceeding it can lead to tire failure, blowouts, and compromised vehicle handling. Drivers must ensure their vehicle's weight, including cargo, does not exceed the combined capacity of its tires.

Question 13: For commercial drivers, what does GVW stand for?

Gaseous Volume and Weight.
Gas Varying Weight.
Gross Vehicle Weight. (Correct answer)
Grand Van Weight.

Correct answer: Gross Vehicle Weight.

For commercial drivers, GVW stands for Gross Vehicle Weight. This term refers to the total weight of a vehicle, including its chassis, body, engine, fuel, accessories, driver, passengers, and all cargo. It's a critical measurement used to ensure that the vehicle does not exceed its design limits or legal weight restrictions, which are essential for safety and road preservation.

Question 14: Why should you cover your cargo during its transportation?

To protect the cargo from weather only.
To protect people (pedestrians, passengers and other civilians) from the cargo's contents if it spills.
To help your vehicle accelerate smoothly.
There is no reason.
To protect people (pedestrians, passengers and other civilians) from the cargo's contents if it spills and to protect the cargo from weather. (Correct answer)

Correct answer: To protect people (pedestrians, passengers and other civilians) from the cargo's contents if it spills and to protect the cargo from weather.

Covering cargo is essential for two main reasons: to protect the cargo itself from adverse weather conditions like rain, snow, or sun, and more importantly, to protect other road users and the environment. A cover prevents cargo from spilling, blowing off, or otherwise escaping the vehicle, which could create hazards for pedestrians, other drivers, and the surrounding area.

Question 15: The tire load is ______.

Used to specify the contents of your tire.
The tire's full weight.
The tire's quality rating.
The tire load is the maximum safe weight a tire can carry at a specified pressure. (Correct answer)

Correct answer: The tire load is the maximum safe weight a tire can carry at a specified pressure.

The tire load rating indicates the maximum weight a tire is designed to safely support when inflated to its recommended pressure. This rating is crucial for preventing tire failure, such as blowouts, and ensuring stable vehicle handling. Drivers must ensure that the total weight of their vehicle and cargo does not exceed the combined load capacity of all tires.

Question 16: Why should you never leave your vehicle unattended without chocking the wheels?

Because the vehicle might cause injury and damage.
There is no reason.
Because the vehicle might roll away and cause injury and damage. (Correct answer)
Because it's the law.

Correct answer: Because the vehicle might roll away and cause injury and damage.

Leaving a commercial vehicle unattended without chocking the wheels is extremely dangerous because the vehicle might roll away and cause injury and damage. Even with parking brakes engaged, there's a risk of brake failure or the vehicle rolling due to inclines or vibrations. Chocking the wheels provides an essential physical barrier, preventing unexpected movement and ensuring safety.

Question 17: What does a service brake system do?

The system that applies and releases the parking brakes when you are parking.
None of the listed answers.
The system that uses the parking brake system only to stop the vehicle during normal driving.
The system that applies and releases the brakes when you use the brake pedal during normal driving. (Correct answer)

Correct answer: The system that applies and releases the brakes when you use the brake pedal during normal driving.

The service brake system is the primary braking system used for slowing down or stopping a vehicle during normal operation. It is activated by pressing the foot brake pedal, which then applies pressure to the brake components to create friction and reduce vehicle speed. This system is distinct from parking brakes or emergency brake systems.

Question 18: How often should alcohol containers be checked during cold weather?

Every two weeks.
Every month.
Every week.
Every day. (Correct answer)
Every five hours.

Correct answer: Every day.

Alcohol containers (or air tank alcohol evaporators) are used in air brake systems to prevent moisture from freezing in the air lines during cold weather. To ensure they are functioning effectively and have enough alcohol, their fluid levels should be checked daily. This daily check is crucial for maintaining the integrity and safety of the air brake system in freezing temperatures.

Question 19: The service brake system ________.

Applies and releases the brakes when you use the brake pedal during normal driving. (Correct answer)
Is not on vehicles with air brakes.
Is not necessary if the vehicle has a park brake system.
Maintain the air tank pressure.

Correct answer: Applies and releases the brakes when you use the brake pedal during normal driving.

The service brake system is the main braking system operated by the driver's foot pedal. Its function is to apply and release the brakes for routine deceleration and stopping of the vehicle during normal driving. This system is essential for everyday operations and is separate from the parking or emergency brake systems.

Question 20: Which of the following is a necessary step to test your service brakes?

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

Correct answer: All of the listed answers.

To properly test service brakes, several steps are necessary to ensure safety and functionality. These include waiting for normal air pressure, releasing the parking brake, and then moving the vehicle forward slowly (typically 5 mph) before applying the foot brake firmly. This allows the driver to check for proper braking action, straight stopping, and any unusual pulling.

Question 21: The braking system of combination vehicles ________.

Do not work in the winter.
None of the listed answers.
Are inefficient.
Has parts to control the trailer brakes. (Correct answer)

Correct answer: Has parts to control the trailer brakes.

Combination vehicles, such as a tractor-trailer, have complex braking systems that must control both the tractor and the trailer brakes simultaneously. This requires specialized components like a trailer air supply control and a trailer hand valve, which allow the driver to manage the air pressure and braking action of the attached trailer. These parts are crucial for safe and coordinated braking across the entire vehicle combination.

Question 22: What do shut-off valves do?

Expel oil and water.
None of the listed answers.
Stop water from being drained out of the air tanks.
Permit closing the air lines off when another trailer is not being towed. (Correct answer)

Correct answer: Permit closing the air lines off when another trailer is not being towed.

Shut-off valves, also known as gladhand shut-off cocks, are located at the end of the air lines on a tractor. Their purpose is to close off the air lines when a trailer is not connected, preventing air loss from the tractor's air brake system. This ensures that the tractor maintains proper air pressure and that the air lines are protected from contamination when not in use.

Question 23: What keeps air in the truck brake system when the trailer develops a bad leak?

The Johnson bar.
The hand safety valve.
The trailer hand valve.
The tractor protection valve. (Correct answer)

Correct answer: The tractor protection valve.

The tractor protection valve is a critical safety device in a combination vehicle's air brake system. Its primary function is to prevent the loss of air pressure from the tractor's air tanks if the trailer develops a severe leak or becomes disconnected. This ensures that the tractor retains sufficient air pressure to operate its own brakes, allowing the driver to safely stop the tractor even if the trailer's air system fails.

Question 24: You are testing your trailer's emergency brakes. First you should _____.

Push in the trailer air supply control.
Pull harshly on the trailer.
Charge the trailer air brake system. (Correct answer)
Pull gently on the trailer with the tractor.

Correct answer: Charge the trailer air brake system.

Before testing a trailer's emergency brakes, it is essential to first charge the trailer air brake system. This means connecting the air lines from the tractor to the trailer and allowing the trailer's air tanks to fill to normal operating pressure. Once the system is charged, the emergency brakes can be properly tested by applying and releasing the trailer air supply control.

Question 25: Knowing how to couple and uncouple correctly is ________.

Only significant for drivers operating older vehicles.
Unimportant if the driver is competent.
Necessary only for drivers who are under 19.
Important for the safe operation of combination vehicles. (Correct answer)

Correct answer: Important for the safe operation of combination vehicles.

Correctly coupling and uncoupling a combination vehicle is a fundamental skill for CDL drivers. Improper procedures can lead to serious accidents, such as the trailer detaching from the tractor, loss of air brakes, or damage to equipment. Therefore, mastering these procedures is crucial for ensuring the safety of the driver, the vehicle, and other road users.

Question 26: If you are applying for a Class B CDL, you will be required _ of the ____ versions of a pre-trip inspection in the vehicle you have brought with you for testing.

One, five
One, three (Correct answer)
Two, three.
Three, three
Two, four.

Correct answer: One, three

For a Class B CDL skills test, applicants are required to perform one of the three versions of the pre-trip inspection. This inspection must be conducted on the specific vehicle brought for testing. The different versions ensure comprehensive knowledge of vehicle components and safety checks relevant to Class B vehicles.

Question 27: The air pressure governor cut-out is typically within what psi range?

50-90 psi.
100-120 psi.
120-140 psi. (Correct answer)
180-200 psi.

Correct answer: 120-140 psi.

The air pressure governor in an air brake system controls when the air compressor starts and stops. The cut-out pressure is the point at which the compressor stops pumping air into the tanks, typically set between 120-140 psi. This range ensures sufficient air pressure for safe braking while preventing over-pressurization of the system.

Question 28: When checking your hydraulic brakes, pump the brake pedal three times and make sure you hold it down for ______. The brake pedal should not depress during this time.

30 seconds.
23 seconds.
15 seconds.
10 seconds.
5 seconds. (Correct answer)

Correct answer: 5 seconds.

When checking hydraulic brakes, a common test involves pumping the brake pedal three times and then holding it down firmly for five seconds. During this five-second period, the pedal should not move or depress further. Any significant depression indicates a potential leak or other issue in the hydraulic brake system that needs immediate attention.

Question 29: All versions of the Class A Pre-trip inspection test will include _______.

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

Correct answer: All of the listed answers.

All versions of the Class A Pre-trip Inspection test are designed to assess a driver's ability to thoroughly inspect a combination vehicle for safe operation. This includes a detailed in-cab inspection of controls and gauges, an engine start to check vital systems, and a comprehensive inspection of the coupling system to ensure the tractor and trailer are securely connected. These elements are fundamental to safe driving.

Question 30: How many versions of the Class A Pre-trip Inspection test exist?

Three.
Eight.
Four (Correct answer)
Two

Correct answer: Four

There are four different versions of the Class A Pre-trip Inspection test. These versions are designed to cover a broad range of inspection points and ensure that applicants have a comprehensive understanding of how to check a combination vehicle for safe operation. While the specific components inspected may vary slightly between versions, the core knowledge and skills required remain consistent.

CDL CLASS A COMMERCIAL DRIVER'S LICENSE PRACTICE TEST

What offense is a serious traffic violation?