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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Missouri 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 Missouri CDL Manual. Take this practice test now to prepare for the actual MO CDL combination test!
1. The two most important things that a driver can do to prevent a rollover when driving a combination vehicle are:
Keeping cargo near the center of the vehicle and driving slowly on turns
Keeping cargo near center of vehicle and driving slowly on the highway
Driving slowly around turns and keeping the cargo as close to the ground as possible
2. If loose or missing, _______ may cause movement between the frame and fifth wheel assembly.
locking pins
mounting bolts
electric connectors
3. Never drive with landing gear only part way up. Why?
It may catch on railroad tracks.
It may be harder to use.
It must be exactly 5 feet off the ground.
4. If ABS is not working:
you should use the emergency brake.
you will still have brakes.
you should use the parking brake.
5. What is the proper following distance for a 50 foot truck traveling at 50 mph?
5 seconds
25 seconds
6 seconds
6. What happens when the center of gravity of a truck moves higher up from the road?
The truck becomes easier to turn over.
The vehicle is more stable while turning.
It is easier it is to turn around corners.
7. How do you find out how many seconds of following distance you have?
Pass a stationary object and count how many seconds it takes the vehicle ahead of you to reach the same spot.
Wait until the vehicle ahead of you passes a pavement marking, shadow or landmark. Then count off the seconds until you reach the same spot.
Wait until the vehicle ahead of you passes a pavement marking or some other clear landmark, then use the stopwatch on your mobile phone to see how long it takes you to reach the same spot.
8. If your brakes get wet, it can cause them:
to apply unevenly.
to be weak.
All of the above.
9. If your vehicle gets stuck on the railroad tracks, you should:
get out of your vehicle and away from the tracks.
gather up your paperwork and shipping papers while calling 911, then get out of the vehicle.
check for identifiable landmarks to give the location of the crossing.
10. If you unlock the pintle hook with the dolly still under the rear trailer:
your vehicle might roll away.
the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
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MO 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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