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 possible answer choices. Test questions come from the New Mexico Commercial Driver License 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. Mirrors should be used:

Only when there may be an emergency.

Regularly.

By a helper to monitor your blind spots.

When driving, you should frequently check the mirrors on both sides of your vehicle.

2. Too much air pressure in a tire:

Is not possible.

Is encouraged on long drives.

Can be dangerous.

Tires should never have too much air pressure. Be sure to check your tires' air pressure with a gauge during inspections.

3. Emergency brakes:

Are not required on vehicles with air brakes.

Are required only on buses.

Are required on all vehicles.

All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.

4. Dry bulk tanks:

Usually have low centers of gravity.

Usually have high centers of gravity.

Are usually not allowed to cross railroad tracks.

Dry bulk tanks require special care to be driven, both because they have high centers of gravity and because the weight of the load can shift in transit.

5. If the low air pressure warning signal comes on, you should:

Continue driving, but have the brakes repaired within a week.

Pull over and inspect the brakes.

Phone a mechanic while driving.

If the low air pressure warning signal comes on while you are driving a vehicle with air brakes, you should immediately bring the vehicle to a safe stop while you are still able to control the brakes. Inspect and repair the brakes as soon as possible.

6. If you are braking on dry pavement while traveling at 55 mph, how much distance will brake lag add to your overall stopping distance?

32 feet

45 feet

20 feet

The total stopping distance for vehicles equipped with air brakes is made up of four factors: perception distance, reaction distance, brake lag distance, and braking distance. When braking at a speed of 55 mph while driving on dry pavement, the brake lag can add around 32 feet to the vehicle's total stopping distance.

7. How do ice cream trucks become hazardous to other drivers?

Ice cream trucks must be kept cold.

Children often run toward an ice cream truck without looking for other traffic.

Ice cream trucks leave trails of water and ice on the roadway.

Ice cream trucks can create hazardous conditions for other drivers because they attract children. Children often do not notice or pay attention to other vehicles on the roadway when running to or from ice cream trucks.

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