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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Wyoming 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 Wyoming CDL Manual. Take this practice test now to prepare for the actual WY CDL combination test!
1. The tractor protection valve:
controls the emergency brakes on combination vehicles.
works the trailer brakes.
supplies air to the trailer air tanks.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
2. To prevent rollover, you should:
go slowly around turns.
keep the cargo as close to the ground as possible.
drive slowly around on ramps and off ramps.
All of the above.
3. When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:
back up gently to ease the pressure on the fifth-wheel locking jaws.
inspect the trailer supports.
pull the tractor forward until the fifth-wheel comes out from under the trailer.
immediately apply your tractor parking brakes.
4. If your ABS is not working:
the drive wheels will begin to spin, and you should take your foot off the accelerator.
it will slow your truck to a halt and force you to pull over.
you still have normal brake functions, and should drive and brake as you always have.
you should immediately bring your vehicle to a complete stop.
5. By pushing the trailer air supply control knob in, you:
supply the tires with air.
shut the air off and put on the trailer emergency brakes.
keeps air in the tractor or truck brake system.
supply the trailer with air.
6. The first thing to do when coupling a tractor-semitrailer is to:
check the trailer height.
lock the trailer brakes.
inspect the fifth wheel.
position the tractor.
7. Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:
use only the braking force necessary to stop safely.
brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.
monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
drive slower to keep your vehicle in a straight line.
8. If a trailer does not have spring brakes, to keep the trailer from moving you should:
use the service brakes.
use wheel chocks.
park on a slight decline.
close the brake valve.
9. Before transporting sealed loads, you should check:
a small sample of whatever is inside.
the special transit permit.
that you don't exceed gross weight and axle weight limits.
None of the above.
10. If you're feeling tired while driving you should:
stop driving and get some rest.
increase your speed to get to your destination quicker.
drink coffee.
eat something.
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WY CDL Combination Test

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