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 four possible answer choices. Test questions come from the West Virginia Commercial Driver’s 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. Air tank drains:

Allow rain water to enter the tank.

Are used to drain water and compressor oil from the air tank.

Should never be opened.

Must remain open during transit.

In an air brake system, the air storage tanks must be drained to remove accumulated water and compressor oil. Failing to do so can cause damage. Manually operated drains should be used at the end of each day of driving.

2. When steering to avoid a crash, you should:

Only use one hand to steer.

Keep both hands on the steering wheel.

Not use your mirrors to check other lanes.

Speed up as you get nearer to the hazard.

When turning quickly to avoid colliding with a hazard in the roadway, you should always keep both hands on the steering wheel. You must have a firm grip on the wheel to be able to turn quickly.

3. What is removed when an air tank is drained?

Water and oil

Ammonia

Wood

Chlorine

In an air brake system, the air storage tanks are equipped with drains to allow water and compressor oil to be removed. The water and oil can damage the brakes if left to accumulate in the system.

4. Fatigue:

Has little effect on driving.

Can impair driving.

Is not noticeable.

Driving while fatigued is dangerous and increases the risk of a crash. Take precautions before a trip to prevent driving while fatigued.

5. During a written exam:

Cell phones may be placed on airplane mode.

Cell phones must be turned off.

Cell phones may be left on, but must be set in a face down position.

Cell phones may be left on.

All electronic devices must be turned off while a written exam is being taken.

6. The service brake system:

Applies and releases the brakes when you press the brake pedal while driving normally.

Applies and releases the parking brakes.

Applies and releases the emergency brake.

Applies and releases the axle brake.

Air brakes consists of three separate braking systems: the service brake system, the parking brake system, and the emergency brake system. The service brake system applies and releases the brakes when you use the brake pedal while driving normally.