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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 North Carolina doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NC CDL doubles triples test covers the following sections of the North Carolina CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NC CDL practice test now to prepare for the actual test!
1. To prevent rollover, you should:
drive slower around corners.
drive faster on ramps and off ramps.
drive in the left lane whenever possible.
All of the above.
2. Empty trucks:
require a greater stopping distance than full trucks.
require a shorter stopping distance than full trucks.
require the same stopping distance than full trucks.
None of the above.
3. Your vehicle has air brakes. To stop, you should:
pull the parking brake control knob out.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
pump the brake pedal 3 times.
push the brake pedal down.
4. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The front trailer is twice as likely to turn over as the tractor.
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
None of the above.
5. Who is responsible for inspecting the cargo?
The person who loaded and secured the cargo
The motor carrier
The shipper
The driver
6. When coupling twin trailers, the more heavily loaded semitrailer should:
have its brakes locked.
be in the rear.
have chocked wheels.
be in first position behind the tractor.
7. Which of the following is not a type of retarder?
8. Which of the following will off-track the most?
The rear wheels of the last trailer.
The front wheels of the tractor.
The front wheels of the last trailer.
The rear wheels of the tractor.
9. With an engine fire, you should:
turn the engine off as soon as possible.
not shoot foam from the vehicle’s underside.
open the hood as soon as possible.
All of the above.
10. If you have to drive off the road, you should:
leave the road completely.
brake as hard as you can to maintain control.
keep one set of wheels on the pavement, if possible.
fully apply the brakes until your speed has dropped to about 20 mph.
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NC CDL Doubles Triples Test

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