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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 have convex mirrors, be aware that:
everything appears smaller in a convex mirror than it would if you were looking at it directly.
in a convex mirror objects appears larger than they really are.
objects seem closer than they really are.
2. If the drive wheels begin to spin when accelerating, you should:
take your foot off the accelerator.
brake gently.
continue to accelerate.
3. On any upgrade, gravity:
speed you up.
slows you down.
doubles your speed.
4. When approaching a vehicle with a distracted driver, you should:
quickly pass the vehicle.
maintain your safe following distance.
change lanes quickly.
5. After a tire has been changed, the driver should stop a short while later to:
check the tightness of the nuts.
deflate the tire to 10 psi.
decrease tire pressure.
6. If you have a manual transmission, when stopping don't _______ until the engine rpm is down close to idle.
shift to second gear
push the clutch in
place the transmission in park
7. When the ______ closes, it stops any air from going out of the tractor.
height control valve
hand valve
tractor protection valve
8. Most heavy vehicles require ________ change gears.
double shifting
double clutching
single clutching
9. If a drawbridge does not have a signal light or traffic control attendant, you should:
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.
10. You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:
raised slightly off the ground.
fully lowered.
fully raised.
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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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