Instructions

Knowledge Test Class A

This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has three or four possible answer choices. Test questions come from the Mississippi Professional Driver’s Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination, Doubles and Hazardous Materials. Endorsements that may be used with a Class A CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.

Number of Question 50

Passing Score 40

1. If using the spring brakes while hauling a heavy load, a complete stop will:

Be impossible.

Take a long time.

Take a short amount of time.

Damage the brakes.

Spring brakes will activate in a vehicle with air brakes if the pressure in the air system becomes too low. A heavily loaded vehicle will take a long time to stop when using only the spring brakes because the spring brakes do not work on all axles.

2. In a dual air brake system:

Air tanks are shared by both systems.

Each system has its own air tanks.

You must designate which system you are using.

Brakes on only one side of the vehicle will work.

Most heavy-duty vehicles use dual air brake systems. A dual air brake system consists of two separate air brake systems, connected by a single set of brake controls. Each system has its own air tanks.

3. The air compressor is connected to the:

Transmission.

Engine.

Radiator.

The air compressor of an air brake system is connected to the engine through gears or a v-belt. The compressor may be air-cooled or cooled by the engine cooling system.

4. A CMV should:

Not have a fire extinguisher, unless transporting hazardous materials.

Not have a fire extinguisher, unless the vehicle will be traveling through remote areas.

Not have a fire extinguisher.

Have a fire extinguisher and other emergency equipment.

All commercial motor vehicles are required to be equipped with the proper emergency equipment. This may include spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and at least one properly charged and rated fire extinguisher.

5. Which of the following is not a part of an air brake system?

A service brake system

A parking brake system

An emergency brake system

An axle brake system

Air brakes consists of three separate braking systems: the service brake system, the parking brake system, and the emergency brake system.

6. Leaking shock absorbers:

Are normal.

Indicate a potentially dangerous defect.

Will prevent the turn signals from working.

Pose no threat if the vehicle is only driven on highways.

The suspension system keeps a vehicle's axles in place. Damaged suspension parts, such as leaking shock absorbers, may be potentially dangerous defects on a vehicle.

7. When driving through a curve during the skills test, you should:

Veer from your lane if needed to complete the curve.

Reduce your speed after entering the curve.

Refrain from looking for other vehicles while turning.

Reduce your speed before entering the curve.

When approaching a curve during the on-road driving skills test, you must reduce your speed sufficiently before entering the curve so that you do not need to further brake or shift in the curve. Keep the vehicle in its lane and continue to check for traffic in all directions.

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