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The CDL general knowledge test is required to be taken by all CDL applicants. The Ohio 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 Ohio 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 OH 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 inspecting the cargo, make sure it is:
secured properly for the first 50 miles after beginning a trip.
not overloaded.
piled up.
2. You should NOT use the parking brakes if:
the brakes are too dry.
the brakes are very hot.
the brakes are cold.
3. 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:
keep backing up.
turn the wheel more  in the direction you want to go.
turn the wheel the other way to follow the trailer.
4. How should you apply the brakes when going down a steep downgrade?
Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
Apply the brakes as hard as you can without locking the wheels.
Apply the brakes when you reach the bottom of the downgrade.
5. When steering to avoid a crash, you should:
steer with one hand so that you can turn the wheel more quickly.
not turn any more than needed to clear what is in your way.
apply the brakes while turning.
6. To avoid blinding other drivers, you should dim within ____ of an oncoming vehicle.
1000 feet
250 feet
500 feet
7. On any upgrade, _________ – the more you will have to use lower gears to climb hills or mountains.
the steeper the grade
the longer the grade
All of the above.
8. _________ are used on many vehicles to provide extra gears.
Retarders and multi-speed rear axles
Auxiliary transmissions and power steering cylinders
Multi-speed rear axles and auxiliary transmissions
9. Gross vehicle weight (GVW) is:
the total weight of a single vehicle including its load.
the total weight of a single vehicle, except its load.
the total weight of the vehicle axle.
10. Fully loaded trucks require greater stopping distances than empty vehicles. True or False?
True, but only if the truck was built after 1998.
True, but only on wet surfaces.
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OH CDL Knowledge Test

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