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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Hawaii 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 Hawaii CDL Manual. Take this practice test now to prepare for the actual HI CDL combination test!
1. The trailer hand valve should be used only:
in driving to prevent skids.
when the trailer is fully loaded.
to test the trailer brakes.
2. If a load is placed on one side of the trailer:
the steering axle weight will be too light to steer safely.
a rollover is more likely.
making turns may be easier.
3. Combination vehicles _________ than single CMVs.
are safer in bad weather
require more driving skill
are much easier to drive
4. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
the trailer emergency brakes to come on.
the vehicle to slide back and forth.
the springs to put on the brakes.
5. The service line:
carries power steering fluid to control the trailer brakes.
carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
carries air to the parking brake to control the trailer brakes.
6. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
50 miles
25 miles
20 miles
7. Which of the following statements about off-tracking is true?
Longer vehicles off-track less.
If there is more than one trailer, the rear wheels of the last trailer will off-track the most.
When a vehicle goes around a corner, the rear wheels follow the same path as the front wheels.
8. Older trailers do not have spring brakes. If the air supply leaks away:
the trailer will stop normally.
the ABS won't work properly.
there will be no emergency brakes.
9. If your ABS is not working:
it will slow your truck to a halt and force you to pull over.
the drive wheels will begin to spin, and you should take your foot off the accelerator.
you still have normal brake functions, and should drive and brake as you always have.
10. If a load is 50 feet long, the minimum number of tie-downs required is:
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HI CDL Combination Test

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