CDL COMBINATION PRACTICE TEST MISSOURI

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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. In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
100 to 120 psi
10 to 20 psi
20 to 45 psi
2. A trailer jackknife is more likely to happen when the trailer is:
loaded to its full capacity.
empty.
overloaded.
3. Inspecting the fifth-wheel does NOT include:
checking for missing or damaged parts.
backing until the fifth-wheel just touches the trailer.
checking that there are no cracks in the frame.
4. Transporting hanging meat requires special attention. Why?
Because hanging meat can be an unstable load with a high center of gravity.
Because you have to drive fast to get it delivered fresh.
Because refrigerated trucks have less traction.
5. Overloading can have negative effects on:
steering.
braking.
All of the above.
6. When backing a trailer on a curved path you should back towards:
either side.
the driver's side.
neither side (back up straight).
7. The use of brakes on a steep downgrade is:
a supplement to the braking effect of the engine.
the main braking factor.
much more effective than the engine braking effect.
8. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:
prevent movement of cargo.
keep from rolling back.
hold compressed air.
9. If the safety relief valve in the air brake system releases air:
the valve is fully operational.
this will supply more power to the brakes.
something is wrong.
10. When driving at night you should:
use your high beams when it is safe and legal to do so.
always use low beams.
All of the above.
 
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Frequently Asked Questions

Teens between 15 and 18 years old must follow the three steps of Missouri's Graduated Driver License Program:
  • Instruction permit ? you must be 15 years old.
  • Intermediate license ? you must be 16 years old and have held the permit for at least 182 days.
  • Full driver license (class F) ? you must be 18 years old.

You can complete the DMV written test at a Missouri State Highway Patrol examination station (no appointment required). After passing the exam, go to a Missouri driver license office to apply and pay for the instruction permit. If you are a minor, your parent/legal guardian must accompany you to the license office.

You must present specific documents when applying for the first time:
  • Proof of identity (provide further proof to verify any name change).
  • Proof of lawful status.
  • Proof of Social Security Number (If you don’t have a SSN, sign the affidavit provided by the license office and present a letter from the Social Security Administration about your situation).
  • Proof of Missouri residency.
  • Driver examination record to prove that you've passed the vision and the DMV written test. You can request it in person at any Missouri license office or by email at the Driver License Record Center.

You can check the list of acceptable documents here.

The DMV written test in Missouri is offered in various languages, including Chinese, French, German, Greek, Italian, Korean, Russian, Spanish, Vietnamese, Japanese, and Bosnian. Although language options are provided, it is advisable to have a basic understanding of English since road signs are always in English.

To prepare for the DMV written test, read the Missouri Driver's Handbook and take our free practice tests. Topics covered on the exam include road signs, parallel parking, turning, passing a vehicle, yielding the right of way, etc. Once your scores are good, you are ready for the real exam.
The Missouri DMV written test comprises 25 questions and is designed to evaluate your knowledge of general traffic laws in preparation for the road test. You should study the manual carefully to ensure success on your first attempt. 

You can make up to 5 mistakes on the Missouri DMV written test. To pass, you need to answer at least 20 questions correctly, achieving an 80% accuracy rate. Take your time to read each question accurately.

For new drivers in Missouri, there are specific restrictions based on their age:

Instruction permit:
  • If you are under 16, you may operate only under the supervision of a parent/legal guardian, a driving instructor, or an adult who is 25 or older with a driver's license for at least 3 years. When you turn 16, you may operate if accompanied by a licensed driver who is at least 21 years old, seated in the front seat.

Intermediate license:
  • For the first 6 months, you cannot transport more than one passenger under 19 (unless they are siblings). After this period, you can drive with a maximum of three passengers under 19.
  • You cannot drive alone from 1 a.m. to 5 a.m., except for school/job activities or emergencies, unless accompanied by a licensed driver who is at least 21 years old.

A Missouri instruction permit is valid for 12 months and can be renewed. To renew, provide proof of identity and Missouri residency at any Missouri license office, and pay for a duplicate permit.

MO CDL Combination Test

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