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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 Delaware doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The DE CDL doubles triples test covers the following sections of the Delaware CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this DE CDL practice test now to prepare for the actual test!
1. In a combination vehicle, ________ is most likely to turn over.
the tractor
the last trailer
the trailer behind the tractor
All of the above.
2. If your brakes fail on a steep mountain downgrade, you should:
stay on the road and keep looking for the next available escape ramp.
slow down until your vehicle comes to a complete stop.
decide what to do as soon as you know your brakes do not work.
set the parking brake and park in an open area.
3. Under a pressurized system, the radiator cap:
should never be hot.
should never be removed until the system has cooled.
should always be cool.
should be removed when the coolant is hot.
4. Foundation brakes are used:
at each wheel.
only with the right wheels.
only with the rear wheels.
only with the front wheels.
5. To avoid becoming an aggressive driver you should:
give other drivers the benefit of the doubt.
make gestures to other drivers.
speed up if you think you’re going to be late.
give other drivers your full attention.
6. Texting while operating a commercial motor vehicle is:
acceptable if you are contacting your supervisor.
only allowed at night.
acceptable if you are contacting your dispacther.
7. When a combination vehicle goes around a corner:
the driver must keep the rear of your vehicle far away from the curb.
the rear wheels of the trailer will never off-track.
the front and rear wheels follow a different path.
All of the above.
8. If you are being tailgated, you should:
turn on your taillights.
increase your speed very gradually.
open up room in front of you.
make quick changes.
9. How should you brake if your vehicle loses ABS?
Brake as you always have.
Stay off the Brake
Pump the brake repeatedly
Step on and off the brake pedal several times
10. Over-length loads:
require special transit permits.
require special driving care.
may require special equipment such as "wide load" or flags.
All of the above.
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DE Doubles Triples CDL Test

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