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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. Brake fade results from, and is affected by:
excessive heat caused by using the brakes too much.
brakes out of adjustment.
All of the above.
2. If a worker is close to the roadway in a work zone, you should:
reduce your speed below the posted speed limit.
pull off the road and stop.
drive at the posted speed limit.
3. Combination vehicles usually:
are easier to drive than single than single CMVs.
are shorter than single than single CMVs.
require more driving skill than single CMVs.
4. When should you use the hand valve to park a combination vehicle?
When parking downhill.
To park at loading docks.
5. You must check that all shut-off valves are in the open position except the ones:
at the back of the last trailer.
on the first trailer in a set of doubles.
on the middle trailer of a set of triples.
6. If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
To prevent water and dirt from getting into the coupler and the air lines.
Because if you don't, you will never build system pressure.
To prevent overheating.
7. Tar in the road pavement rising to the road surface in very hot weather:
is very sticky and will slow down your vehicle.
does not affect the road surface or driving conditions.
causes the road to become very slippery.
8. The tractor protection valve:
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
controls the emergency brakes on combination vehicles.
supplies air to the trailer air tanks.
9. Which of these is more likely to rollover due to the "crack-the-whip" effect?
The front trailer of 65 ft. conventional doubles
The last trailer of doubles
The last trailer of triples
10. Which of the following is not a reason for covering cargo?
To protect people from spilled cargo
To protect the cargo from weather
To prevent other drivers from looking at the cargo
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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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