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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Kentucky 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 Kentucky CDL Manual. Take this practice test now to prepare for the actual KY CDL combination test!
1. If your ABS is not working:
you still have normal brake functions, and should drive and brake as you always have.
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 should immediately bring your vehicle to a complete stop.
2. If you will be transporting hazardous materials that require placards, you must:
transport the materials at night only.
ask permission of the local transportation agency.
obtain a special transit permit.
obtain a hazardous materials endorsement.
3. If a drawbridge does not have a signal light or traffic control attendant, you should:
get through the drawbridge as quickly as possible.
drive through the drawbridge with caution.
stop and look to make sure the draw is completely closed before crossing.
stop at least 5 feet before the draw of the bridge.
4. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
5. Emergency brakes must be must be held on by:
the locking mechanism.
mechanical force.
air pressure.
6. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the trailer emergency brakes will come on.
the trailer supply valve will stay open.
the tractor will lose all air pressure.
the engine will shut down.
7. When a vehicle goes around a corner, the rear wheels:
follow a different path than the front wheels.
will lock up.
will turn freely.
follow the same path as the front wheels.
8. 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.
9. You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
10. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep the vents clear so they work correctly.
keep an eye on your tires.
go slowly around turns.
make sure that the release arm is in the engaged position.
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KY CDL Combination Test

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