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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Delaware CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Delaware CDL Manual. Take this practice test now to prepare for the actual DE CDL combination test!
1. If the spring brakes do not release when you push the trailer air supply control, you should:
check the electrical cables.
pump the brakes.
rev or lug the engine.
check the air line connections.
2. When you are uncoupling a loaded trailer, lower the landing gear until:
the pressure in the system is above 55 psi.
makes contact with the ground, and leave the trailer off the fifth wheel.
the tractor frame is under the trailer.
it makes firm contact with the ground.
3. How can you tell if a converter dollie has ABS?
There is an ABS system on the right side of the dolly.
There is a red lamp on the left side of the dolly.
There is a yellow lamp on the left side of the dolly.
There is an ABS plaque on the right side of the dolly.
4. Loose cargo:
could fall off your vehicle and cause traffic problems.
could hurt or kill you during a quick stop.
can be a danger to others and yourself.
All of the above.
5. If a trailer does not have spring brakes, to keep the trailer from moving you should:
use wheel chocks.
use the service brakes.
park on a slight decline.
close the brake valve.
6. Which of the following is NOT a good rule for using turn signals?
Cancel your signal after you have turned.
Put your turn signal on after the turn.
Signal continuously until you have completed the turn.
Signal well before you turn.
7. The first thing to do when coupling a tractor-semitrailer is to:
lock the trailer brakes.
check the trailer height.
position the tractor.
inspect the fifth wheel.
8. Dual tires:
should come in contact with each other whenever possible.
should not come in contact with each other.
are dangerous.
should always come in contact with each other.
9. The parking brake:
should be used when you need to apply the brakes firmly.
should be used whenever you park.
should be used when driving in bad weather.
All of the above.
10. Air brakes:
can improve fuel efficiency.
are an effective way to stop large and heavy vehicles.
are prohibited on larger vehicles.
should be used only when driving on wet roads.
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DE CDL Combination Test

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