Instructions

Knowledge Test Class B

This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the driver). To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has three possible answer choices. Test questions come from the Arizona Commercial Driver License Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving.. Endorsements that may be used with a Class B CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.

Number of Question 50

Passing Score 40

1. Hanging meat:

Should never be transported by trailer.

Can be an unstable load.

Must be approved by the Environmental Protection Agency (EPA).

An operator should drive with care when transporting a cargo of hanging meat. Such a load is unstable, both because it has a high center of gravity and because the swinging of the meat can affect the driver's handling of the vehicle.

2. What does the air compressor governor do?

It stops the compressor from pumping air.

It turns on the air compressor.

It stores the compressed air.

In an air brake system, the air compressor governor controls when the air compressor pumps air into the storage tanks. It stops pumping if the pressure in the tanks becomes too high, and begins pumping if the pressure becomes too low.

3. What is a Gross Vehicle Weight Rating (GVWR)?

The value stated by the manufacturer as the loaded weight of a single vehicle

The rating of a tire

The rating of a combination vehicle per axle

Gross Vehicle Weight Rating (GVWR) is the value specified by the manufacturer as the loaded weight of a single vehicle.

4. When applying your brakes, the vehicle should:

Pull to one side.

Squeak.

Not pull to either side.

Your vehicle pulling to one side or the other while you are braking can indicate trouble with the brakes.

5. You should test the low pressure warning signal by:

Turning on the engine and applying the trailer hand brake.

Rapidly pressing and releasing the brake pedal.

Removing wheel chocks and disengaging the parking brake.

It is essential that your low pressure warning light functions properly. After allowing the system to charge, you can test the warning signal by rapidly applying and releasing the brake pedal. This will release air from the braking system and the warning signal should come on when pressure drops to a dangerous level.

6. Air brakes use ____ to function.

Compressed air

Liquid air

Nitrogen

Air brakes function through the use of compressed air.

7. When starting a vehicle, warning lights and buzzers:

Should not light up or sound.

Should turn on and shut off quickly.

Should turn on and remain on.

After starting a vehicle's engine, the warning lights and buzzers should turn on, then quickly turn off.

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