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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. The height of a vehicle's center of gravity is important for safe handling. Why?
A high center of gravity means you are less likely to tip over.
Trucks with a high center of gravity have better traction.
Trucks with a high center of gravity can roll over at the posted speed limit for a curve.
2. You should avoid driving through flowing water of deep puddles if possible. If not, you should:
press the accelerator and increase the engine and gear speed to the rpm required by road conditions.
gently apply the brakes, increase engine rpm and cross the water while keeping light pressure on the brakes.
set out reflective triangles to warn other traffic.
3. Which of the following statements about cargo weight is true?
It is always safe to operate at legal maximum weights.
States have maximums for GVWRs, GCWRs and axle weights. You must keep weights within legal limits.
The shipper loads the cargo, and the driver is not responsible for recognizing overloads and poorly balanced weight.
4. Blocking _______________ to keep it from sliding.
is used in the front, back, and/or sides of a piece of cargo
is used only in the back of a piece of cargo
goes from the upper part of the cargo to the floor
5. During a trip:
you should watch gauges to make sure that valve caps are not missing.
you should watch gauges for signs of trouble.
you should not watch gauges as they can be misleading.
6. If brakes fail on a long downgrade, you should:
use an escape ramp if it is available.
pump the brake pedal 3 times.
turn off the engine as soon as you.
7. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
5, 50 and 500 feet
10, 100 and 200 feet
5, 25 and 50 feet
8. Which of the following statements about brake shoes is true?
Brake drums must have cracks longer than half the width of the friction area.
Brake shoes should be thinner than ΒΌ inch.
None of the above.
9. After starting the engine, the ABS light stays on. This means:
the ABS is not working properly.
the ABS is in Neutral.
the ABS is working properly.
10. Using a helper when backing up is:
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CDL Knowledge Test OH

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