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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Washington 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 Washington CDL Manual. Take this practice test now to prepare for the actual WA CDL combination test!
1. In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
100 to 120 psi
20 to 45 psi
10 to 20 psi
2. If the drive wheels start to skid:
push in the clutch to let them turn freely.
use the brakes to slow down.
accelerate slightly to regain control.
3. When backing, as soon as you see the trailer getting off the proper path, you should:
to keep a firm grip on the steering wheel and continue backing.
turn the top of the steering wheel in the direction of the drift.
turn the top of the steering wheel in the opposite direction of the drift.
4. Which of the following is NOT part of a trailer air line system?
Glad hands
Emergency air-line
5. If you must drive slowly, how should you alert following drivers?
Flash your brake lights
Use your emergency flashers if it is legal
Turn on your taillights
6. Combination vehicles _________ than single CMVs.
are much easier to drive
require more driving skill
are safer in bad weather
7. On any upgrade, gravity:
doubles your speed.
speed you up.
slows you down.
8. Which of the following will NOT help you prevent rollover?
Driving slowly around turns.
Using the controlled braking method.
Keeping the cargo as close to the ground as possible.
9. A truck tractor with _________ requires the shortest stopping distance.
a lightly loaded trailer
a fully loaded trailer
an empty trailer
10. Anti-lock brakes:
help you stop faster.
increase your stopping distance.
keep your brakes from locking up when you brake hard.
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WA CDL Combination Test

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