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200+ Free Oklahoma CDL Combination Practice Questions

Pass your Oklahoma CDL Combination Vehicles Test exam on the first try — instant access, no signup required.

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Which items belong in a coupling-area inspection?

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D
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Key Facts: Oklahoma CDL Combination Exam

80%

Minimum passing score for CDL knowledge tests

FMCSA / 49 CFR §383.135

26,001 lb

Group A GCWR threshold when the towed unit is over 10,000 lb GVWR

49 CFR §383.91

$25

CareerTech ServiceOK fee for one CDL written exam in a test session

Oklahoma CareerTech ServiceOK Licenses

4

Maximum CDL written exams per CareerTech ServiceOK test session/day

Oklahoma CareerTech ServiceOK Licenses

Oklahoma Class A CDL applicants should study Service Oklahoma CDL Driver Manual Section 6 before taking the Combination Vehicles written test. CareerTech lists the ServiceOK CDL Combination Vehicles Exam with CDL written testing fees of $25 for one exam session, tiering up to $40 for four exams in one session/day. Federal CDL rules require at least 80% correct on each knowledge test, and a failed combination-vehicle portion prevents issuance of a Group A CLP or CDL.

Sample Oklahoma CDL Combination Practice Questions

Try these sample questions to test your Oklahoma CDL Combination exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1Which Oklahoma CDL written test is required for drivers seeking Class A combination-vehicle privileges?
A.The Combination Knowledge written test
B.Use only the trailer hand valve for normal stopping
C.Skip the visual inspection if the vehicle moves during a tug test
D.Drive at normal speed and correct problems after the trip
Explanation: Oklahoma says Class A applicants must pass Combination Knowledge written testing, plus General Knowledge and any applicable Air Brake or endorsement tests. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
2In Oklahoma CDL classification rules, Class A generally means GCWR of 26,001 pounds or more when the towed unit is over what GVWR?
A.Use only the trailer hand valve for normal stopping
B.10,000 pounds
C.Skip the visual inspection if the vehicle moves during a tug test
D.Drive at normal speed and correct problems after the trip
Explanation: Oklahoma lists Class A as a qualifying combination when the towed vehicle has GVWR over 10,000 pounds. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
3What does GCWR stand for?
A.Use only the trailer hand valve for normal stopping
B.Skip the visual inspection if the vehicle moves during a tug test
C.Gross Combination Weight Rating
D.Drive at normal speed and correct problems after the trip
Explanation: GCWR is Gross Combination Weight Rating, the combined rating used for tractor-trailer and other combination classifications. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
4What does GVWR stand for?
A.Use only the trailer hand valve for normal stopping
B.Skip the visual inspection if the vehicle moves during a tug test
C.Drive at normal speed and correct problems after the trip
D.Gross Vehicle Weight Rating
Explanation: GVWR is Gross Vehicle Weight Rating, the rating assigned to a single vehicle or towed unit. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
5What minimum score is required on CDL knowledge tests under 49 CFR 383.135?
A.80 percent correct
B.Use only the trailer hand valve for normal stopping
C.Skip the visual inspection if the vehicle moves during a tug test
D.Drive at normal speed and correct problems after the trip
Explanation: Federal CDL rules require at least 80 percent correct on each knowledge test. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
6Who administers Oklahoma CDL and CLP testing logistics?
A.Use only the trailer hand valve for normal stopping
B.Service Oklahoma Driver Services
C.Skip the visual inspection if the vehicle moves during a tug test
D.Drive at normal speed and correct problems after the trip
Explanation: FMCSA sets federal minimum standards, but Service Oklahoma Driver Services administers Oklahoma CDL testing. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
7What is a combination vehicle?
A.Use only the trailer hand valve for normal stopping
B.Skip the visual inspection if the vehicle moves during a tug test
C.A truck or tractor pulling one or more trailers
D.Drive at normal speed and correct problems after the trip
Explanation: A combination vehicle is a powered unit pulling one or more trailers, such as a tractor-semitrailer. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
8What extra area must be inspected on a combination vehicle compared with a straight truck?
A.Use only the trailer hand valve for normal stopping
B.Skip the visual inspection if the vehicle moves during a tug test
C.Drive at normal speed and correct problems after the trip
D.The coupling area between tractor and trailer
Explanation: Combination inspections add the fifth wheel, kingpin, locking jaws, air lines, electrical cord, landing gear, and trailer condition. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
9Why must trailer lights be checked after coupling?
A.To confirm other traffic can see trailer clearance, turns, brake lights, and hazards
B.Use only the trailer hand valve for normal stopping
C.Skip the visual inspection if the vehicle moves during a tug test
D.Drive at normal speed and correct problems after the trip
Explanation: The electrical connection must operate required trailer lights and signals. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.
10Before driving, what should be true of the landing gear?
A.Use only the trailer hand valve for normal stopping
B.It is fully raised and the handle is secured
C.Skip the visual inspection if the vehicle moves during a tug test
D.Drive at normal speed and correct problems after the trip
Explanation: Landing gear must be raised completely and secured before the combination moves. Source basis: Service Oklahoma CDL/CLP guidance, the Service Oklahoma CDL Driver Manual, FMCSA CDL Manual Section 6, and 49 CFR Part 383.

About the Oklahoma CDL Combination Exam

The Oklahoma CDL Combination Vehicles Test is the written knowledge test for drivers seeking Class A commercial driving privileges for qualifying tractor-trailer and other combination vehicles. Service Oklahoma directs applicants to study the official CDL Driver Manual, and Oklahoma CareerTech lists the CDL Combination Vehicles Exam among ServiceOK written tests. FMCSA Part 383 supplies the federal Group A vehicle standard and the 80% minimum knowledge-test passing score. The tested knowledge centers on combination inspection, fifth wheel and kingpin coupling, air and electrical lines, landing gear, trailer brakes, off-tracking, rollover prevention, safe turns, backing, trailer skids, jackknife recovery, speed, and space management.

Assessment

Multiple-choice Oklahoma CDL knowledge test for Class A combination applicants; ServiceOK/CareerTech lists a separate CDL Combination Vehicles Exam, and applicants may also need General Knowledge, Air Brake, or endorsement tests depending on the vehicle sought.

Time Limit

Not published by Service Oklahoma or FMCSA for the Combination Vehicles knowledge test

Passing Score

At least 80% correct on each CDL knowledge test under 49 CFR §383.135

Exam Fee

$25 for one ServiceOK/CareerTech CDL written exam session; $30 for two exams, $35 for three, or $40 for four exams; credential fees vary by class and term (Service Oklahoma)

Oklahoma CDL Combination Exam Content Outline

Core Section 6 area

Driving Combination Vehicles Safely

Rollover risk, high center of gravity, rearward amplification, off-tracking, wide turns, low-clearance crossings, backing, trailer swing, jackknife prevention, speed, and space management.

Core Section 6 area

Combination Vehicle Air Brakes

Trailer hand valve, tractor protection valve, trailer air supply, service and emergency lines, glad hands, crossed lines, leaks, ABS, and trailer brake checks.

Core Section 6 area

Coupling and Uncoupling

Fifth wheel, kingpin, locking jaws, trailer height, high coupling, tug test, visual lock check, landing gear, chocks, line stowage, and safe release sequence.

Core Section 6 area

Inspecting Combinations

Coupling area, trailer frame, suspension, tires, brakes, lights, reflective tape, landing gear, air/electrical lines, cargo security, and final pre-departure checks.

State/federal licensing area

Oklahoma and FMCSA CDL Basics

Service Oklahoma CDL written testing, CareerTech fee sessions, Group A rules, official CDL manual use, ELDT context, and federal 80% passing score.

How to Pass the Oklahoma CDL Combination Exam

What You Need to Know

  • Passing score: At least 80% correct on each CDL knowledge test under 49 CFR §383.135
  • Assessment: Multiple-choice Oklahoma CDL knowledge test for Class A combination applicants; ServiceOK/CareerTech lists a separate CDL Combination Vehicles Exam, and applicants may also need General Knowledge, Air Brake, or endorsement tests depending on the vehicle sought.
  • Time limit: Not published by Service Oklahoma or FMCSA for the Combination Vehicles knowledge test
  • Exam fee: $25 for one ServiceOK/CareerTech CDL written exam session; $30 for two exams, $35 for three, or $40 for four exams; credential fees vary by class and term

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

Oklahoma CDL Combination Study Tips from Top Performers

1Read Service Oklahoma CDL Driver Manual Section 6 before drilling practice questions.
2Turn coupling into a checklist: inspect fifth wheel, align tractor, check trailer height, back slowly, tug test, inspect jaws and gap, connect lines, charge air, test brakes, raise landing gear, and check clearance.
3Memorize red emergency/supply and blue service glad-hand functions, then practice crossed-line and air-leak scenarios.
4Study control risks as cause and effect: speed plus high center of gravity increases rollover, hard braking can lock trailer wheels, and off-tracking makes trailer wheels cut inside turns.
5Before testing, confirm current Service Oklahoma and CareerTech CDL written-test locations, session fees, medical-card requirements, ELDT status, and CLP steps.

Frequently Asked Questions

Who needs the Oklahoma CDL Combination Vehicles test?

Drivers seeking Oklahoma Class A privileges for qualifying combination vehicles generally need the Combination Vehicles knowledge test unless an official transfer, waiver, or restriction rule applies.

What score do I need to pass?

FMCSA requires at least 80% correct on each CDL knowledge test. 49 CFR §383.135 specifically says a driver who fails the combination-vehicle portion must not be issued a Group A CLP or CDL.

How much does Oklahoma CDL written testing cost?

Oklahoma CareerTech lists ServiceOK CDL written testing fees of $25 for one exam in a session, $30 for two exams, $35 for three exams, and $40 for four exams.

What topics are on the Oklahoma combination test?

Study combination inspection, fifth wheel and kingpin coupling, trailer height, tug and visual checks, air and electrical lines, landing gear, trailer brake controls, off-tracking, rollover, safe turns, backing, trailer skids, jackknife recovery, speed, and space management.

Is the Combination Vehicles test the same as Doubles/Triples?

No. Combination Vehicles is core Class A knowledge. Doubles/Triples is a separate endorsement area for pulling more than one trailer.