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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. When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.
five times more likely
ten times more likely
three times more likely
2. After a tire has been changed, the driver should stop a short while later to:
decrease tire pressure.
check the tightness of the nuts.
deflate the tire to 10 psi.
3. If ABS is not working:
you should use the parking brake.
you will still have brakes.
you should use the emergency brake.
4. Which of the following is NOT part of checking the sliding fifth-wheel?
Checking that it is properly greased
Checking that all locking pins are present and locked in place
Testing the tractor protection valve
5. If the drive wheels begin to spin when accelerating, you should:
take your foot off the accelerator.
continue to accelerate.
brake gently.
6. A red triangle with an orange center means:
The vehicle is hauling hazardous materials
Slow-moving vehicle
Law enforcement vehicle
7. A burning tire must be:
covered with cloth.
immediately removed from the vehicle.
cooled with water.
8. When connecting the glad hands, you should press the two seals together with the couplers at a ______ angle to each other.
30 degree
45 degree
90 degree
9. If your vehicle thumps or vibrates heavily, it may be a sign that:
one of the tires has gone flat.
you need to shift up.
the brakes have failed.
10. Most heavy trucks with manual transmissions require ____ to change gears.
triple clutching
single clutching
double clutching
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WA CDL Combination Test

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