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The CDL general knowledge test is required to be taken by all CDL applicants. The Oklahoma 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 Oklahoma 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 OK 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. When driving on slippery roads, you should NOT:
use the speed retarder.
brake any harder than necessary.
All of the above.
2. The most common type of brake is the:
S-cam drum brake
R-cam drum brake
G-cam disc brake
3. What should you do at an accident scene, among other things, to help prevent another accident?
Stay in your vehicle andĀ file an accident report.
If you are stopping to help, park in the area immediately around the accident.
Put on your 4-way emergency flashers.
4. One way to prevent hydroplaning is to:
take curves at higher speeds.
have less than 4/32 inch tread depth in every major groove on front tires.
make sure you have enough tread on your tires.
5. ABS:
causes your wheels to lock when you break hard.
gives you more control when you brake.
is not required on newer trucks.
6. When backing a trailer, you should turn the steering wheel to the right to make the trailer go left (or vice versa). Once the trailer starts to turn, you should:
turn the wheel moreĀ  in the direction you want to go.
turn the wheel the other way to follow the trailer.
keep backing up.
7. The Gross Combination Weight (GCW) is:
the weight of the trailer and cargo.
the weight of the vehicle, trailer, and cargo.
the total weight of a single vehicle including its load.
8. Empty trucks have _________ heavily loaded trucks.
more traction than
less traction than
the same traction as
9. Name some exhaust system parts.
Main spring, axle and font axle hanger
Drag link, spindle and gear box
Mufflers, mounting brackets and vertical stacks
10. When approaching and driving through a work zone, you should:
observe the posted speed limits.
slow down.
All of the above.
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OK CDL Knowledge Test

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