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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 Kentucky doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The KY CDL doubles triples test covers the following sections of the Kentucky CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this KY CDL practice test now to prepare for the actual test!
1. To make the brakes work, air brakes use:
hydraulic air.
carbon monoxide.
compressed air.
2. If a load is 50 feet long, the minimum number of tie-downs required is:
3. If you hear a loud loud "bang" and the steering feels "heavy", you should:
hold the steering wheel firmly and stay off the brake.
pump the brakes until the vehicle has slowed down.
brake hard and pull off the road.
check your rearview mirrors to see if you have a flat tire.
4. Containerized loads are used:
when the cargo has been or will be carried by rail or ship.
when transporting explosives.
when transporting liquids.
when the cargo exceeds the weight limit.
5. What is the most important reason to inspect your vehicle?
Achieving the best gas mileage.
Vehicle inspection is required by federal and state laws.
Saving money by preventing costly repairs.
Your safety and that of other road users.
6. Right after it starts to rain, the road is very slippery. Why?
Because black ice may form on the road.
Because rain is very slippery.
Because the water mixes with oil left on the road by vehicles.
None of the above.
7. When driving a double or triple:
the lighter trailer should be directly behind the tractor.
the more heavily loaded trailer should be directly behind the tractor.
all trailers should have the same weight.
the more heavily loaded trailer should be in the rear.
8. Doubles and triples:
can be stopped suddenly due to their weight.
have a lower chance of skidding.
can be turned suddently due to the low center of gravity.
can't be turned suddenly.
9. Air storage tanks:
are installed in the first tank the air compressor pumps air to.
pump air into the air storage tanks.
hold compressed air for the brakes.
use parts of the service brake systems to stop the vehicle in a brake system failure.
10. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
assume the car left the roadway and change lanes as normal.
wait until you are sure the car isn't in your blind spot.
ease into the other lane slowly so the other car can get out of the way.
None of the above.
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KY Doubles Triples Test

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