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.. Read More

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 70-question test. Test questions come from the Texas Commercial Motor Vehicle Drivers Handbook. Each question has four answer choices. To pass, applicants must answer 56 questions correctly. Test questions come from the Texas Commercial Motor Vehicle Drivers Handbook. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination Vehicles, Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving. Endorsemetns that may be used with a Class A CDL are: Hazardous materials, Tank, Passenger, Doubles/Triples, HazMat and Tank, Air Brakes and School bus.

Number of Question
Passing Score

15. When inspecting the exhaust system, which of the following should not cause concern?

Explanation
When inspecting a vehicle's exhaust system, be alert to a number of potential problems, including loose, broken, or missing exhaust pipes, mufflers, tailpipes, or vertical stacks; loose, broken, or missing mounting brackets, clamps, bolts, or nuts; exhaust system parts rubbing against fuel system parts, tires, or other moving parts of the vehicle; and exhaust system parts that are leaking.

16. You will lose your CDL for at least ____ for a first railroad-highway grade crossing violation.

Explanation
A first-time offense for a railroad-highway grade crossing violation will result in the loss of one's CDL for at least 60 days.

17. How much water is needed on a road surface for a vehicle to hydroplane?

Explanation
Hydroplaning is an effect in which a vehicle's tires lose traction with the surface of the road and instead glide along a layer of water. There does not have to be much water on the road for this to occur.

18. When starting the vehicle during the pre-trip inspection, the coolant temperature should:

Explanation
After starting your vehicle during the pre-trip inspection, you should watch the gauges. The coolant temperature should gradually rise to a normal operating range.

19. If you are being tailgated, you should:

Explanation
If someone is tailgating you, it is a good idea to open up the space ahead of your vehicle to make it easier for the driver to pass you. Increasing your speed is not a good idea because the driver may continue to tailgate you at the higher speed, only increasing the danger.

20. To correct a drive-wheel braking skid, a driver should do all of the following, except:

Explanation
To correct a drive-wheel braking skid, you should first remove your foot from the brake pedal to allow the locked wheels to begin rolling again. Quickly steer in the direction you want to go, then countersteer to prevent your vehicle from skidding in the opposite direction.

21. When driving a vehicle equipped with an Anti-Lock Braking System (ABS), you should:

Explanation
When driving a tractor-trailer combination that is equipped with an Anti-Lock Braking System (ABS), you should brake in the same manner that you would if the vehicle was not equipped with ABS.
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