CDL Practice Test Flashcards

Questions and Answers

A straight truck or bus air brake system should not leak at the rate of more than ______ psi per minute with the engine off and the brakes released.

Checking your vehicle's suspension does NOT include checking:

The tires (correct)

The axle positioning parts

The shock absorbers

The air suspension components

You have passed all the requirements for a 'Class B' bus driver's license. Which of these vehicles are you not licensed to drive?

Class C bus

Class A bus (correct)

Class B bus

An en-route inspection should include checking what?

Both of these Signup and view all the answers

If you can see the rear or front end of the vehicle but can't see the driver, what must you assume?

She/he can't see you Signup and view all the answers

If the air in the tanks is not drained:

Your brakes may fail because of water freezing Signup and view all the answers

What should you do when your vehicle hydroplanes?

Release accelerator Signup and view all the answers

A driver crosses the air lines when hooking up to an old trailer. What will happen?

If the trailer has no spring brakes, you could drive away but you would not have their trailer brakes Signup and view all the answers

Which of these do not provide extra gears on some trucks?

Automatic transmission Signup and view all the answers

What is the best way to test your vehicle's low air pressure warning signal?

Step on and off the brake pedal with the engine off to reduce air pressure below 60 psi Signup and view all the answers

Buses may carry:

Small arms ammunition labeled form-d Signup and view all the answers

How are buses to handle most railroad grade crossings?

Come to a complete stop before crossing Signup and view all the answers

What is the punishment for using a commercial vehicle for a felony involving the transportation of controlled substances?

Lifetime disqualification Signup and view all the answers

Which of these is a good rule for backing a straight bus?

None of these Signup and view all the answers

If you are traveling at 55 mph in a 30 foot vehicle, how many seconds of following distance should you leave?

4 seconds Signup and view all the answers

If you want to couple a second trailer to your combination vehicle, secure it by using:

Both if available Signup and view all the answers

How many different states' Commercial Driver's Licenses can you hold simultaneously?

One Signup and view all the answers

Your bus is disabled. The bus, with riders aboard, may be towed or pushed to a safe place only:

If getting off the bus would be more risky for the other riders Signup and view all the answers

The new BAC (Blood Alcohol Concentration) for commercial drivers to be considered intoxicated when driving a commercial vehicle is:

0.04 Signup and view all the answers

The spring brake used on the chambers in a straight truck will bring you to a stop when air pressure drops below ____ psi.

20 Signup and view all the answers

Converter dollies often do have spring brakes.

True Signup and view all the answers

What distance from the fire should you be when using an extinguisher?

As far away as possible Signup and view all the answers

In ideal conditions, a truck or bus equipped with an air brake traveling at 55 mph would require what stopping distance?

More than 450 feet Signup and view all the answers

What is the purpose of West Virginia being part of the Driver License Compact?

Keep roads safer by making sure traffic violations you receive in other states end up on your West Virginia driving record. Signup and view all the answers

To check if the converter dolly is securely coupled to the rear trailer you should:

Pull gently against the pin of the second trailer Signup and view all the answers

Blocking the cargo to keep it from sliding must be done:

At the front, back, and/or the side of a piece of cargo Signup and view all the answers

What happens to tar on the road pavement during hot weather?

It bleeds, making the road surface slippery Signup and view all the answers

What can cause a vehicle fire?

Short circuits and loose connections Signup and view all the answers

Study Notes

Air Brake Systems

A straight truck or bus air brake system must not leak more than 2 psi per minute with the engine off and brakes released.
Spring brakes in straight trucks activate when air pressure drops below 20 psi.

Vehicle Inspection

En-route inspection should check tire temperature and cargo securement.
Vehicle suspension checks exclude tire inspections.
Converter dollies often have spring brakes, aiding in safe towing.

Licensing and Vehicle Operation

A Class B bus driver is not licensed to operate a Class A bus.
Only one state's Commercial Driver's License can be held simultaneously.

Safety Procedures

When hydroplaning, drivers should release the accelerator.
If the driver's visibility is obstructed, assume they cannot see you.
Buses must come to a complete stop before crossing railroad grade crossings.

Cargo and Towing Regulations

Blocking cargo is essential to prevent sliding, requiring support from the front, back, and side.
When coupling a second trailer, secure it using both wheel chocks and the trailer's spring brakes if available.

Alcohol and Traffic Violations

The BAC limit for commercial drivers to be considered intoxicated is 0.04.
West Virginia participates in the Driver License Compact to ensure traffic violations in other states impact the driving record.

Emergency Situations

In case of vehicle fires, the most effective strategy is to use an extinguisher from a distance, ideally as far away as possible.
Short circuits and loose connections are common causes of vehicle fires.

Driving Distances and Maneuvers

At 55 mph in a 30-foot vehicle, leave a following distance of at least 4 seconds.
Ideal stopping distance for a truck or bus with air brakes traveling at 55 mph exceeds 450 feet.

Additional Safety Tips

During hot weather, tar on road surfaces becomes slippery, increasing the risk of accidents.
Inspection and proper coupling of converter dollies are vital for safe towing, which includes gently pulling against the pin of the second trailer to ensure security.

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Description

Test your knowledge with these flashcards designed for the CDL practice test. Each card contains crucial questions and answers related to air brake systems and vehicle suspension checks. Perfect for anyone preparing for their commercial driving license exam.