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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. If brakes fail on a long downgrade, you should:
turn off the engine as soon as you.
use an escape ramp if it is available.
set the parking brake.
pump the brake pedal 3 times.
2. You should always adjust your speed to be able to stop within:
the distance you can see ahead.
30 feet.
50 feet.
the length of your vehicle.
3. When driving double and triple trailers, drivers should:
steer gently and go slowly around corners.
allow more following distance.
look far ahead.
All of the above.
4. Most heavy-duty vehicles use:
air brakes.
hydraulic brakes.
pressure brakes.
solid brakes.
5. Doubles:
are less likely to rollover than straight trucks.
require more reaction time than straight trucks.
are easier to drive than straight trucks.
None of the above.
6. To prevent getting sleepy while driving, you should:
drive alone whenever possible.
close the vent.
keep cool by opening the window.
keep the cab warm.
7. What is the minimum tread depth for tires other than front tires?
8/32 inch
2/32 inch
4/16 inch
4/32 inch
8. How can you tell if a converter dollie has ABS?
There is a yellow lamp on the left side of the dolly.
There is an ABS plaque on the right side of the dolly.
There is an ABS system on the right side of the dolly.
There is a red lamp on the left side of the dolly.
9. When the spring brakes are on, you should:
exceed the posted speed limit.
not push the brake pedal down.
pump the brakes.
press the accelerator.
10. If there is a fire in your vehicle, do NOT:
pull into a service station.
park in an open area.
park away from buildings and other vehicles.
notify emergency services.
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KY CDL Doubles Triples Test

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