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 two, three or four possible answer choices. Test questions come from the Nebraska 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. Most heavy-duty vehicles use ____ air brake systems.

Single

Dual

Triple

Quad

The majority of heavy-duty vehicles are equipped with dual air brake systems.

2. What do headers do?

Protect the driver during a crash

Provide a place for storage

Ensure that controls are accessible

Act as wind guards

Front-end header boards protect the driver from the forward motion of their cargo in the event of a crash or emergency stop.

3. Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.

Spring brakes

Parking brakes

Air brakes

Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when air tank pressure falls to a level between 20 and 45 psi. You can do this by chocking the wheels and releasing air from the braking system by stepping on and off the brake pedal. Once the pressure levels drop to an unsafe level, the parking brake valve should pop out and spring brakes should come on.

4. When going down a steep downhill, your primary source of braking should be:

Engine adjustments/downshifting.

Using the brake.

Using the parking brake.

Using ABS.

On a steep downgrade, you must use the engine's braking effect as your primary method of speed control. Be sure to decelerate and downshift appropriately before beginning to drive down the hill.

5. A vehicle equipped with an Anti-Lock Braking System (ABS) can be identified by:

A sticker on the control panel.

A yellow lamp on the instrument panel.

The letters "ABS" on the brake pedal.

A metal plate on the inside of the driver’s side door.

You can tell that your vehicle is equipped with an Anti-Lock Braking System (ABS) if it has a yellow ABS malfunction lamp on the instrument panel.

6. A ____ allows a driver to gradually apply spring brakes.

Modulating control valve

Trailer air supply control

Relay valve

A modulating control valve allows a driver to gradually apply spring brakes. In equipped vehicles, the valve is controlled by a lever located on the dashboard.

7. Eating while driving:

Is a good way to maximize your time.

Is encouraged during long trips.

Is a distraction to the driver.

Eating while driving can be a dangerous distraction to the driver both because it diverts their attention away from the task at hand and requires them to remove a hand from the steering wheel.

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