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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Kansas 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 Kansas CDL Manual. Take this practice test now to prepare for the actual KS CDL combination test!
1. The emergency air line does NOT:
supply air to the trailer air tanks.
pump air into the relay valves, allowing the trailer brakesto be applied more quickly.
cause the tractor protection valve to close when the emergency line loses pressure.
control the emergency brakes on combination vehicles.
2. Which of the following is true about the trailer hand valve?
If used in driving it could cause the trailer to skid.
The trailer hand valve works the trailer brakes.
It should be used only to test the trailer brakes.
All of the above.
3. You are hooking up to an old trailer. The trailer does not have spring brakes. If you cross the air lines:
the trailer hand valve will apply the tractor brakes instead of the trailer brakes.
you will be able to drive away but you will not have trailer brakes.
the glad hands will be locked together.
None of the above.
4. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
left; right
right; right
left; left
right; left
5. Tests have shown that trucks with a high center of gravity are more likely to tip over, therefore you should:
distribute the cargo as low as possible.
put the lightest parts of the cargo under the heaviest parts.
distribute the cargo so the majority of the weight is on the steering axle.
All of the above.
6. As part of the final air brake check, you should:
Test air leakage rate.
Test low pressure warning signal.
Check air compressor governor cut-in and cut-out pressure.
All of the above.
7. The best way to recognize that your trailer has started to skid is:
by seeing it in your mirrors.
by opening the window and feeling the front of the mirror.
by feeling the brakes come on.
by recognizing tire failure.
8. After starting the engine, oil pressure should rise to a normal level:
within 2 minutes.
within seconds.
within 3 miles.
within 6 minutes.
9. Glad hands are used to:
connect the electrical lines from the truck or tractor to the trailer.
connect the brakes from the truck or tractor to the trailer.
connect the service and emergency air lines from the truck or tractor to the trailer.
the air compressor is connected to the engine.
10. The parking brake:
should be used when you need to apply the brakes firmly.
should be used when driving in bad weather.
should be used whenever you park.
All of the above.
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KS 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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