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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. Cargo should be properly covered:
to protect the weather from the cargo.
to protect people from spilled cargo.
to block your view or someone else’s.
All of the above.
2. Poor weight balance:
improves handling.
can make vehicle handling more difficult.
increases fuel efficiency.
makes it easier to turn.
3. When you park trailers without spring brakes, you should use wheel chocks:
to keep the trailer from moving.
to prevent air from escaping.
to prevent the transmission from shifting up.
to prevent overheating.
4. A trailer jackknife is more likely to happen when the trailer is:
loaded to its full capacity.
None of the above.
5. With brake drums, if brakes become too hot:
the brakes will supply too much power to the drive wheels.
your ABS will malfunction.
the brakes may stop working.
the air compressor will kick on to cool the brakes.
6. When the wheels of a trailer lock up:
the vehicle will gradually come to a complete stop.
ABS will increase stopping power.
the trailer will tend to swing around.
All of the above.
7. You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
The brakes on the trailer wheels will not respond.
The brakes on the trailer wheels caused the skid in the first place.
You should use the emergency break instead.
You should use the service break instead.
8. You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
partly engage the clutch before you take your right foot off the brake.
keep the clutch slipping while slowly accelerating.
shift down to a speed that you can control without using the brakes.
use the parking brake to hold the vehicle until the clutch engages.
9. During a trip:
you should watch gauges to make sure that valve caps are not missing.
you should watch gauges for signs of trouble.
you should not watch gauges as they can be misleading.
None of the above.
10. ABS will:
shorten your stopping distance.
not give you more control over the vehicle during braking.
increase your average speed.
not change your normal braking capability.
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KY Combination Test

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