Class B Commercial Driver's License Practice Test -1 — Questions and Answers

Question 1: What is the Motor Carrier Safety Improvement Act of 1999?

A coalition of drivers who operate Commercial Motor Vehicle who promote safe driving.
A law that 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)
None of the listed answers.
A commercial driver license manual.

Correct answer: A law that 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 is a federal law designed to enhance safety in commercial motor vehicle operations. It specifically mandates that CDL holders can be disqualified from operating a CMV if they are convicted of certain serious moving violations, even if those violations occurred in their personal vehicle. This measure aims to hold commercial drivers to a higher standard of safety both on and off the job.

Question 2: During the basic vehicle control portion of the skills test, you will be asked to __________.

Demonstrate your ability to drive your vehicle in a variety of traffic situations.
To fix your vehicle's engine.
Move your vehicle forward, back and turn it within a defined area. (Correct answer)
Demonstrate that your vehicle is safe to drive.

Correct answer: Move your vehicle forward, back and turn it within a defined area.

The basic vehicle control portion of the CDL skills test assesses a driver's fundamental ability to maneuver a large vehicle. During this test, applicants are required to demonstrate precise control by moving the vehicle forward, backward, and turning it within a defined area. This evaluates their proficiency in handling the vehicle's size and weight in controlled environments, which is essential for safe operation.

Question 3: All drivers who need a CDL must take what test?

The general knowledge test. (Correct answer)
Air brakes test.
Combination vehicles test.
Motorcycle skills test.

Correct answer: The general knowledge test.

All drivers seeking a Commercial Driver's License (CDL) are required to pass the general knowledge test. This test covers fundamental rules, regulations, and safe operating practices applicable to all commercial motor vehicles. It ensures that every CDL holder possesses a baseline understanding of commercial driving principles before specializing in specific vehicle types or endorsements.

Question 4: What offense is a serious traffic violation?

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

Correct answer: All of the listed answers.

Serious traffic violations are offenses that can lead to disqualification from operating a Commercial Motor Vehicle (CMV) if committed multiple times within a certain period. Examples include reckless driving, erratic lane changes, following too closely, and traffic offenses in a CMV connected to fatal accidents. These violations indicate a disregard for safety and pose significant risks on the road.

Question 5: You will be denied or lose your hazardous materials endorsement, if you _______.

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

Correct answer: All of the listed answers.

A hazardous materials endorsement is a special authorization required to transport dangerous goods. You will be denied or lose this endorsement if you have certain felony convictions, are under indictment for specific felonies, or have been committed to a mental institution. These stringent requirements are in place to ensure that individuals transporting hazardous materials meet high security and safety standards, minimizing risks to public safety.

Question 6: During the night, you should dim your lights when you are within _____ feet of an oncoming vehicle.

650
600
575
700
500 (Correct answer)

Correct answer: 500

When driving at night, it is important to dim your high-beam headlights to avoid blinding oncoming drivers. The standard safety guideline is to dim your lights when you are within 500 feet of an oncoming vehicle. This practice helps maintain visibility for other drivers and prevents potential accidents caused by temporary blindness.

Question 7: For what reason should the exhaust system be checked?

None of the listed answers.
A leaking system could cause poor fuel mileage.
A broken exhaust system can cause your brakes to fail.
A leaking exhaust system can allow poisonous fumes into the cab. (Correct answer)

Correct answer: A leaking exhaust system can allow poisonous fumes into the cab.

The exhaust system must be checked regularly because a leaking system poses a serious safety hazard. A leak can allow poisonous carbon monoxide fumes to enter the vehicle's cab, which is odorless and colorless, making it extremely dangerous. Exposure to these fumes can cause drowsiness, disorientation, and even death, highlighting the critical need for a properly sealed exhaust system.

Question 8: Driving at night can be more dangerous because ______.

Drivers are more frustrated at night.
There is a higher risk of encountering aggressive drivers at night.
Drivers are less likely to honk their horns at night.
Drivers can't see hazards as quickly at night. (Correct answer)

Correct answer: Drivers can't see hazards as quickly at night.

Driving at night is inherently more dangerous primarily because drivers cannot see hazards as quickly as they can during the day. Reduced visibility due to darkness limits reaction time, making it harder to spot obstacles, pedestrians, or other vehicles. This increased difficulty in perceiving the environment significantly elevates the risk of accidents.

Question 9: If you take a curve too fast, two things may happen. One is that the tires may keep their traction and the vehicle may roll over. What is the other possibility?

The ABS will shut off.
The brakes may stop working.
You will crash into a pole.
Tires can lose their traction and cause you to skid off the road. (Correct answer)

Correct answer: Tires can lose their traction and cause you to skid off the road.

Taking a curve too fast can lead to two main dangerous outcomes. Besides the vehicle potentially rolling over due to maintaining traction at excessive speed, the other significant possibility is that the tires can lose their traction entirely. This loss of grip will cause the vehicle to skid off the road, resulting in a loss of control and a high likelihood of a crash.

Question 10: Why conduct a pre-trip inspection?

If you conduct a pre-trip inspection, you won't have to pay attention while driving.
You shouldn't conduct a pre-trip inspection. Only inspect the vehicle after the trip.
You could find potential problems that could cause a crash or breakdown. (Correct answer)
This is the only way to prevent an accident.

Correct answer: You could find potential problems that could cause a crash or breakdown.

Conducting a pre-trip inspection is a critical safety measure for all commercial drivers. Its primary purpose is to identify potential problems with the vehicle before starting a journey. By catching issues like faulty brakes, worn tires, or fluid leaks early, drivers can prevent breakdowns, accidents, and costly delays, ensuring the vehicle is safe to operate.

Question 11: What is the minimum number of tiedowns for a 30-foot load?

3 (Correct answer)
8
6
5

Correct answer: 3

Federal regulations specify minimum tiedown requirements for securing cargo to prevent shifting during transit. For a 30-foot load, the general rule is one tiedown for every 10 feet of cargo, plus an additional tiedown for any remaining portion. Therefore, a 30-foot load requires a minimum of three tiedowns to ensure it is adequately secured.

Question 12: Within the first ____ miles of your journey you should always check that your cargo is secure.

100
50 (Correct answer)
25
60

Correct answer: 50

It is crucial for drivers to check their cargo's security shortly after beginning a journey. Within the first 50 miles, the cargo can settle, and tiedowns might loosen due to vehicle movement and vibrations. A re-check ensures that everything remains properly secured, preventing shifting that could lead to instability or cargo loss during the remainder of the trip.

Question 13: A general rule for tying down cargo: you need one tiedown for each _____ ft. of cargo.

20 ft.
30 ft.
15 ft.
10 ft. (Correct answer)

Correct answer: 10 ft.

A fundamental rule for securing cargo is to use one tiedown for every 10 feet of cargo length. This guideline ensures that the load is adequately restrained against movement during acceleration, braking, and turns. Adhering to this rule, along with additional tiedowns for any remaining cargo length, is essential for safe transportation and compliance with regulations.

Question 14: The tire load is ______.

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

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

As a driver hauling cargo, you bear significant responsibility for the safety of your load. This includes knowing that your cargo is properly secured according to regulations and best practices. While inspecting and recognizing overloading are parts of this, the overarching responsibility is ensuring the cargo's securement to prevent shifting, damage, or accidents during transit.

Question 15: As a driver hauling cargo, you are responsible for ______.

All of the listed answers.
Recognizing when your vehicle is overloaded.
Knowing your cargo is secured properly. (Correct answer)
Inspecting your cargo.

Correct answer: Knowing your cargo is secured properly.

As a driver hauling cargo, you are responsible for inspecting your cargo, recognizing when your vehicle is overloaded, and knowing when your cargo is secured properly. [Page, 3--1. 3.1- Inspecting Cargo, Section 3: Transporting Cargo Safely, CDL]

Question 16: What does the air storage tank contain?

Nothing.
Oil.
Water.
Compressed air. (Correct answer)

Correct answer: Compressed air.

Air storage tanks are a vital component of an air brake system in commercial vehicles. These tanks are designed to hold compressed air, which is then used to operate the vehicle's brakes, as well as other air-powered systems. Maintaining adequate air pressure in these tanks is crucial for the proper functioning and safety of the braking system.

Question 17: 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?

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

Correct answer: All of the listed answers.

When testing the service brakes on a hydraulic system, several indicators can signal a problem. If the brake pedal goes to the floor, stopping action is delayed, or the vehicle pulls to one side when braking, these are all signs of potential issues. Any of these symptoms suggest a malfunction that requires immediate attention to ensure safe braking performance.

Question 18: How are the brake drums connected to the wheels?

By hoses.
By belts.
They are not connected.
They are bolted. (Correct answer)

Correct answer: They are bolted.

Brake drums are an integral part of the wheel assembly in many heavy vehicles. They are securely bolted to the wheels, allowing them to rotate together. When the brakes are applied, brake shoes press against the inner surface of the drums, creating friction to slow or stop the vehicle.

Question 19: The parking brake valve should close when the air pressure falls into what range?

70- 85 psi.
20-45 psi. (Correct answer)
100-125 psi.
100-110 psi.
90-95 psi.

Correct answer: 20-45 psi.

In an air brake system, the parking brake valve is designed to automatically close and apply the spring brakes when the air pressure falls to a critically low range. This safety feature typically activates when the air pressure drops between 20-45 psi, ensuring the vehicle remains braked if there's a significant air leak or system failure. This prevents runaway vehicles and enhances safety.

Question 20: What is the air brake lag distance when you are driving at 55 mph on dry pavement?

38 ft.
40 ft.
25 ft.
32 ft. (Correct answer)

Correct answer: 32 ft.

Air brake lag distance refers to the distance a vehicle travels from the moment the driver applies the brakes until the air pressure builds up and the brakes actually begin to take effect. At 55 mph on dry pavement, the typical air brake lag distance is approximately 32 feet. This distance must be accounted for when determining safe following distances and stopping times.

Question 21: You need to check that the dash indicators are working when corresponding lights are turned on for which of the following?

Four-way emergency flashers.
Anti-lock braking system indicator.
High beam headlight.
Turn signals.
All of the listed answers. (Correct answer)

Correct answer: All of the listed answers.

During a vehicle inspection, it's essential to check that all dash indicators are functioning correctly when their corresponding lights are activated. This includes indicators for turn signals, high beam headlights, four-way emergency flashers, and the anti-lock braking system (ABS). Proper operation of these indicators confirms that the vehicle's signaling and safety systems are working, providing crucial information to the driver.

Question 22: You need to check ____ belt for snugness.

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

Correct answer: All of the listed answers.

During a pre-trip inspection, it is crucial to check the snugness of all belts that drive essential engine components. This includes the air compressor belt, water pump belt, alternator belt, and power steering belt. Loose or worn belts can lead to component failure, loss of critical functions like braking or steering, and potential breakdowns.

Question 23: The air pressure governor cut-out is typically within what psi range?

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

Correct answer: 120-140 psi

The air pressure governor in an air brake system controls when the air compressor starts and stops. The governor cut-out pressure is the point at which the compressor stops pumping air into the tanks, typically set within the range of 120-140 psi. This ensures that the air tanks maintain sufficient pressure for safe braking without over-pressurizing the system.

Question 24: The exterior baggage compartments of your vehicle should ______.

Operate properly.
Be undamaged.
All of the listed answers. (Correct answer)
Latch securely.

Correct answer: All of the listed answers.

During a vehicle inspection, all exterior baggage compartments must be thoroughly checked. This includes ensuring they are undamaged, operate properly (e.g., open and close smoothly), and latch securely. Secure and functional compartments prevent cargo loss, protect contents from weather, and ensure the vehicle meets safety and operational standards.

Question 25: On your vehicle inspection test, what should you do to check that your tire is inflated properly?

Give it a good feel.
Use a tire gauge. (Correct answer)
You should not check how inflated the tires are.
Kick the tire.

Correct answer: Use a tire gauge.

To accurately check if your tire is inflated properly, you must use a tire gauge. This tool provides a precise measurement of the air pressure inside the tire, allowing you to compare it against the manufacturer's recommended PSI. Relying on a 'feel' or 'kick' is unreliable and can lead to under- or over-inflation, which compromises safety and tire longevity.

Class B Commercial Driver's License Practice Test -1

What is the Motor Carrier Safety Improvement Act of 1999?