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The CDL general knowledge test is required to be taken by all CDL applicants. The Washington CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Washington CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual WA general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. Parking brakes are:
not required on commercial vehicles with air brakes.
not required on trailers.
required on all vehicles.
2. When driving through a construction zone, you should:
maintain your speed, unless there are people working on or near the roadway.
watch for pavement drop-offs.
turn on your parking lights.
3. When inspecting brakes, you should look for:
shoes worn dangerously thin.
cracked drums.
All of the above.
4. Which of the following is NOT a reason for hydraulic brake failure?
Brake fade on long hills
Stab braking
Loss of hydraulic pressure
5. When inspecting the cargo, make sure it is:
not overloaded.
piled up.
secured properly for the first 50 miles after beginning a trip.
6. When checking the condition of the steering system, you must:
grab the steering mechanism to test for looseness.
Visually inspect the steering mechanism.
Check the windshield wiper arms.
7. If ABS is not working:
a yellow malfunction lamp will light up on the control panel.
the brakes will lock up.
you should stay off the brake.
8. When driving in a construction zone, if a construction worker is near the road, you should:
further reduce your speed.
come to a complete stop.
maintain a constant speed.
9. The most important way to see the sides and rear of your vehicle is to:
get out and walk around the vehicle.
check your mirrors regularly.
look out the window.
10. Checking the engine compartment during the seven-step inspection does NOT include checking:
the engine oil level.
the engine oil temperature.
the power steering fluid level.
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WA CDL Knowledge Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
Number of questions: 50
Correct answers to pass:40
Passing score:80%
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