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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. Tire load is defined as:
the maximum safe weight a tire can carry at a specified pressure.
the minimum safe weight a tire can carry at a specified pressure.
the weight transmitted to the ground by 1 tire.
the minimum tire pressure.
2. If driving a heavy vehicle, you should:
try to pass other vehicles going uphill.
stay in the right lane.
stay in the left lane.
avoid braking.
3. Which of the the following statements about fatigue is true?
Fatigue impairs your vision and judgment.
Fatigue may cause you to not see and react to hazards.
Fatigued driving is one of the leading causes of accidents.
All of the above.
4. Which of the following vehicles is most likely to turn over?
5 axle tractor semitrailer
65 ft. conventional double
Triple trailer
3 axle tractor semitrailer
5. When you push in the red trailer air supply knob, this will:
open the emergency line shut-off valve at the rear of the last trailer.
disconnect the air lines from the trailer.
disconnect the electrical connector.
supply air to the emergency supply lines.
6. ABS helps you:
brake harder.
drive faster.
stop faster.
None of the above.
7. If there is a fire and you are not sure what to use to put it out, you should:
use water.
use a fire extinguisher.
wait for firefighters.
use dry powder.
8. When driving at night you should dim your lights when following another vehicle within:
100 feet.
50 feet.
1 mile.
500 feet.
9. Before operating the vehicle, the driver should:
should not review the vehicle inspection report and immediately try to find any vehicle defects.
review the last vehicle inspection report.
rely on the last vehicle inspection and skip the pre-trip inspection.
None of the above.
10. You should do an after-trip inspection:
once a month.
at least once a week.
after each stop.
after each trip.
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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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