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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Ohio CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Ohio CDL Manual. Take this practice test now to prepare for the actual OH CDL combination test!
1. ABS will:
increase your average speed.
not change your normal braking capability.
shorten your stopping distance.
2. Which of the following is NOT part of checking the sliding fifth-wheel?
Checking that all locking pins are present and locked in place
Checking that it is properly greased
Testing the tractor protection valve
3. What is countersteering?
Staying off the brake while steering to the right to avoid an accident.
Locking your wheels while turning in an emergency situation.
Turning the steering wheel quickly the other way after steering in an emergency situation.
4. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
5. The service line:
carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
carries air to the parking brake to control the trailer brakes.
carries power steering fluid to control the trailer brakes.
6. When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
Using the trailer handbrake to provide air to the service line.
Pulling tractor forward until the fifth-wheel comes out from under the trailer.
Going to the rear of the rig.
7. When approaching a vehicle with a distracted driver, you should:
maintain your safe following distance.
quickly pass the vehicle.
change lanes quickly.
8. The iron trailer supports are up, and the full weight of the trailer is resting on the tractor. Make sure:
there is enough clearance between the rear of the tractor frame and the landing gear.
you are in a low enough gear.
the safety latch is not engaged.
9. Fully loaded rigs:
are much more likely to roll over than empty rigs.
are less likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
10. What factors can cause brakes to fail or fade?
Excessive use of the service brakes
Brakes out of adjustment
All of the above.
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OH CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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