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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. When your vehicle starts to skid, you must take action to:
restore traction to the tires.
use controlled braking.
accelerate and countersteer.
use stab braking.
2. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
activate your hazard lights and drive to the nearest place where you can stop.
pull off the road and stop immediately.
apply the brakes as hard as you can.
slow down and test your brakes.
3. If you will be transporting hazardous materials that require placards, you must:
obtain a hazardous materials endorsement.
obtain a special transit permit.
transport the materials at night only.
ask permission of the local transportation agency.
4. Which of these is more likely to rollover due to the "crack-the-whip" effect?
5-axle tractor semitrailers
The last trailer of triples
The last trailer of doubles
The front trailer of 65 ft. conventional doubles
5. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
greater; more
less; more
less; less
greater; less
6. If your ABS fails:
you will have no brake function, and could lose control.
you will still have normal brake functions.
your tires might grab unexpectedly and you could lose control.
the first step is to get the vehicle off the road and stop.
7. When more cargo is piled up in a truck, the center of gravity moves:
higher up from the road.
closer to the ground.
to the right side of the truck.
to the left side of the truck.
8. An item that is 15 feet long placed on a flatbed trailer should have at least:
1 tie-down.
3 tie-downs.
15 tie-downs.
2 tie-downs.
9. When backing, you should:
back quickly.
avoid using the mirrors.
use a helper if possible.
back and turn toward the right side.
10. Containerized loads are used:
when transporting liquids.
when the cargo exceeds the weight limit.
when transporting explosives.
when the cargo has been or will be carried by rail or ship.
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Doubles Triples DE CDL Test

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