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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. Do NOT use the parking brakes:
when you leave your vehicle.
when you park for less than two hours.
if the brakes are very hot.
2. Which of the following is most likely to roll over?
The rear trailer of a double
The front trailer of a double
The rear trailer of a triple
3. To prevent rollover, you should:
go slowly around turns.
keep the cargo as close to the ground as possible.
All of the above.
4. Which of the following makes a rollover more likely?
Weight that is loaded so there is a high center of gravity.
If the load is to one side so it makes a trailer lean.
All of the above.
5. When checking your tires during a pre-trip inspection, which of the following is acceptable?
Cracks in the tires
Dual tires that come in contact with parts of the vehicle
Tires made by different manufacturers
6. You should use chocks when parking a trailer without spring brakes because:
the brakes will hold only as long as there is air pressure in the trailer air tank.
it is required by law.
it helpsĀ prevent skids.
7. If loose or missing, _______ may cause movement between the frame and fifth wheel assembly.
electric connectors
mounting bolts
locking pins
8. Which of these statements about brakes is true?
Brake fade does not result from excessive heat.
The lighter the vehicle, the more heat the brakes absorb to stop it.
None of the above.
9. When backing a truck you should:
look straight ahead.
get out and walk around the vehicle before you begin to back.
always rely on your mirrors.
10. The use of brakes on a steep downgrade is:
a supplement to the braking effect of the engine.
much more effective than the engine braking effect.
the main braking factor.
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WA CDL Combination Test

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