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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Ohio doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The OH CDL doubles triples test covers the following sections of the Ohio CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this OH CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Ohio.
1. If you will be transporting hazardous materials that require placards, you must:
obtain a hazardous materials endorsement.
obtain a special transit permit.
transport the materials at night only.
2. When checking the lights before driving:
you should check them from inside the vehicle.
make sure the parking brake is not set.
you should turn off the engine.
3. If your vehicle is hydroplaning, you should:
speed up.
stay off the brake.
put the vehicle in reverse.
4. Air storage tanks:
hold compressed air for the brakes.
pump air into the air storage tanks.
use parts of the service brake systems to stop the vehicle in a brake system failure.
5. Which of these is more likely to rollover due to the "crack-the-whip" effect?
The last trailer of doubles
The front trailer of 65 ft. conventional doubles
The last trailer of triples
6. How should you apply the brakes when going down a steep downgrade?
Apply the brakes when you reach the bottom of the 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.
7. Rollovers happen when drivers:
turn too slowly.
brake too hard.
turn too fast.
8. How should you brake if your vehicle loses ABS?
Brake as you always have.
Step on and off the brake pedal several times
Pump the brake repeatedly
9. Excessive use of the service brakes results in overheating. Too much heat can:
cause the brakes to grab.
make the brakes stop working.
cause the brakes apply unevenly.
10. You are driving on a steep downgrade in the proper low gear. Your "safe" speed is 40 mph. When your speed reaches 40 mph, you should:
apply the brakes to gradually reduce your speed to 35 mph, and then release the brakes.
apply the brakes to quickly reduce your speed to 25 mph, and then release the brakes.
increase your speed to approximately 45 mph, and then apply release the brakes.
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OH Doubles Triples CDL Test

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