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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. If you discover a fire, before opening trailer doors you should:
have a helper open the doors.
feel the doors to see if they are hot.
use the fire extinguisher on the doors.
2. Poor weight balance:
can make vehicle handling more difficult.
increases fuel efficiency.
improves handling.
3. Combination vehicles have __ air lines.
4. When you get ready to back under the semi-trailer, you should:
line up directly in front of the trailer.
back under the trailer at an angle to avoid pushing the trailer sideways.
line up about 15 degrees off the line of the trailer.
5. Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
It has yellow ABS malfunction lamps.
The letters "ABS" are printed on the side of the steering wheel.
It was built after March 1, 1998.
6. 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.
All of the above.
7. If a trailer does not have spring brakes, to keep the trailer from moving you should:
use wheel chocks.
use the service brakes.
park on a slight decline.
8. If your trailer starts to skid, you should:
pump the brakes.
release the brakes.
steer in the opposite direction.
9. When going down grades, you should:
shift up.
downshift to a lower gear.
put the transmission in Neutral.
10. What should you do if your vehicle gets stuck on the railroad tracks?
Call 911, then get out of the vehicle and away from the tracks.
Turn on the emergency flashers and call 911.
Get out of the vehicle and away from the tracks as quickly as possible, then call 911.
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CDL Combination Test (MO)

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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