200+ Free OR CDL Combination Practice Questions
Pass your Oregon CDL Combination Vehicles Test exam on the first try — instant access, no signup required.
The “crack-the-whip” effect is mainly caused by:
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Key Facts: OR CDL Combination Exam
80%
Minimum CDL knowledge-test passing score
49 CFR §383.135 / FMCSA
At least 30
Minimum items on each basic vehicle-group knowledge test
49 CFR §383.133 / FMCSA
6 months
Oregon knowledge-test result validity
Oregon DMV
$10
Oregon CDL knowledge test fee
Oregon DMV Commercial Driver License Fees
$40
Original Oregon CLP fee on or after January 1, 2024
Oregon DMV Commercial Driver License Fees
English only
Oregon commercial knowledge-test language
Oregon DMV
Use Oregon Commercial Driver Manual Section 6 as the primary study source for the Oregon CDL Combination Vehicles Test. Focus on off-tracking, wide turns, rollover prevention, backing, trailer skids, jackknife recovery, trailer air supply and service lines, glad hands, tractor protection valves, fifth wheel and kingpin coupling, tug and visual checks, landing gear, and combination inspection. Oregon lists a $10 CDL knowledge test fee and six-month validity for passed knowledge-test results. Federal CDL rules require at least 80% correct, and a failed combination-vehicle knowledge test prevents Group A CLP/CDL issuance.
Sample OR CDL Combination Practice Questions
Try these sample questions to test your OR CDL Combination exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.
1Under Oregon CDL rules, the Combination Vehicles Test is required for drivers seeking to operate which vehicles?
2A Group A/Class A combination generally means a combination with a GCWR of at least 26,001 pounds and a towed unit over:
3What is the best way to reduce rollover risk in a loaded combination vehicle?
4The “crack-the-whip” effect is mainly caused by:
5Oregon Section 6 recommends following at least one second for each 10 feet of vehicle length, plus one extra second when traveling over:
6What is off-tracking?
7When making a right turn with a tractor-trailer, you should mainly watch for:
8During a left turn in a combination vehicle, why should you monitor the left side carefully?
9Before entering a sharp curve with a heavy combination, the safest approach is to:
10Which backing setup is generally preferred for a combination vehicle when available?
About the OR CDL Combination Exam
The Oregon CDL Combination Vehicles Test is the commercial knowledge test Oregon Class A applicants need for tractor-trailer and other qualifying combination operation. Oregon DMV directs applicants to the Oregon Commercial Driver Manual for commercial knowledge tests and lists the Combination Vehicles Test as required to drive Class A combination vehicles. Section 6 covers rollover risk, center of gravity, rearward amplification, steering gently, following distance, off-tracking, wide turns, low-clearance railroad crossings, backing, trailer skids and jackknife recovery, trailer air supply and service lines, glad hands, tractor protection valves, trailer ABS, coupling and uncoupling, fifth wheel and kingpin inspections, landing gear, and combination brake checks. FMCSA Part 383 supplies the federal Group A classification, required combination knowledge areas, test methods, and 80% knowledge-test passing standard.
Assessment
Oregon DMV lists the Combination Vehicles Test as required to drive Class A combination vehicles. Oregon Commercial Driver Manual Section 6 covers driving combinations, combination air brakes, ABS, coupling and uncoupling, and inspecting combinations. FMCSA requires basic vehicle-group knowledge tests to contain at least 30 items and to meet Part 383 standards.
Time Limit
Not published by Oregon DMV or FMCSA for the Combination Vehicles knowledge test
Passing Score
80% minimum on CDL knowledge tests under 49 CFR §383.135
Exam Fee
$10 CDL knowledge test; $40 original Commercial Learner Permit on or after January 1, 2024 (Oregon Driver and Motor Vehicle Services (DMV))
OR CDL Combination Exam Content Outline
Driving Combination Vehicles Safely
Rollover risk, high center of gravity, rearward amplification, steering gently, off-tracking, wide turns, low-clearance railroad crossings, backing, trailer skids, jackknife recovery, following distance, and night speed.
Combination Vehicle Air Brakes
Trailer hand valve, red emergency/supply and blue service lines, glad hands, crossed-line faults, air leaks, tractor protection valve, air flow to trailers, trailer emergency brakes, and trailer service brake tests.
Antilock Brake Systems
ABS warning lamps, wheel-lock prevention, trailer ABS limits, and safe braking expectations for combinations.
Coupling and Uncoupling
Fifth wheel plate and jaws, kingpin, trailer height, high coupling, tug test, no-gap visual inspection, air/electrical line connection, landing gear, chocks, and safe uncoupling sequence.
Inspecting Combination Vehicles
Lower and upper fifth wheel, sliding fifth wheel, release arm and safety latch, air/electric lines, trailer frame, suspension, tires, lights, reflectors, landing gear, cargo doors, load security, and combination brake checks.
Oregon CDL and FMCSA Rules
Oregon Class A testing, English-only commercial knowledge tests, $10 CDL knowledge test fee, six-month knowledge-test result validity, ELDT triggers, Group A vehicle thresholds, federal test-method rules, and 80% passing standard.
How to Pass the OR CDL Combination Exam
What You Need to Know
- Passing score: 80% minimum on CDL knowledge tests under 49 CFR §383.135
- Assessment: Oregon DMV lists the Combination Vehicles Test as required to drive Class A combination vehicles. Oregon Commercial Driver Manual Section 6 covers driving combinations, combination air brakes, ABS, coupling and uncoupling, and inspecting combinations. FMCSA requires basic vehicle-group knowledge tests to contain at least 30 items and to meet Part 383 standards.
- Time limit: Not published by Oregon DMV or FMCSA for the Combination Vehicles knowledge test
- Exam fee: $10 CDL knowledge test; $40 original Commercial Learner Permit on or after January 1, 2024
Keys to Passing
- Complete 500+ practice questions
- Score 80%+ consistently before scheduling
- Focus on highest-weighted sections
- Use our AI tutor for tough concepts
OR CDL Combination Study Tips from Top Performers
Frequently Asked Questions
Who needs the Oregon CDL Combination Vehicles Test?
Oregon DMV lists the Combination Vehicles Test as required to drive Class A combination vehicles. Federal Group A/Class A rules generally cover combinations of 26,001 pounds or more GCWR or actual gross combination weight with a towed unit over 10,000 pounds.
What score do I need to pass?
FMCSA and 49 CFR §383.135 require at least 80 percent correct on CDL knowledge tests. The same rule states that an applicant who fails the combination-vehicle portion must not be issued a Group A CLP or CDL.
What should I study for the Oregon combination test?
Study Oregon Commercial Driver Manual Section 6: driving combinations safely, rollover risk, rearward amplification, off-tracking, turns, backing, trailer skids, combination air brakes, ABS, coupling and uncoupling, fifth wheel and kingpin checks, landing gear, and inspecting combinations.
How much does Oregon CDL knowledge testing cost?
Oregon DMV fee materials list a $10 CDL knowledge test fee and a $40 original Commercial Learner Permit fee on or after January 1, 2024. Check Oregon DMV for current CDL license, endorsement, skills-test, medical, and training costs.
How long are passed Oregon CDL knowledge-test results valid?
Oregon DMV states knowledge-test results are valid for six months from the date passed. CLP applicants must complete all application requirements within those six months or take and pass the knowledge tests again.
Are Oregon commercial knowledge tests available with a translator?
No. Oregon DMV states commercial knowledge tests are offered in English only and translators are not permitted.
Is the doubles/triples endorsement the same as the combination test?
No. Oregon Section 6 covers the minimum knowledge for common combination vehicles. Oregon DMV lists the Doubles/Triples Endorsement Test separately, and Section 6 tells drivers to study Section 7 if they need to pass the doubles/triples test.