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200+ Free Kentucky CDL Combination Practice Questions

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

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The combination of which two trailer dash controls should you fully understand before driving?

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B
C
D
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2026 Statistics

Key Facts: Kentucky CDL Combination Exam

20

Kentucky Combination Vehicles questions for Class A applicants

Kentucky CDL Manual

80%

Passing score for each CDL knowledge test

Kentucky CDL Manual / 49 CFR §383.135

24 hours

Wait after failed Kentucky knowledge test

Kentucky CDL Manual

$5

Retest fee after initial failure for combination, air brake, and endorsement tests

Kentucky CDL Manual

6 months

Kentucky CDL instruction permit validity

Kentucky CDL Manual

14 days

Permit holding period before skills test

Kentucky CDL Manual

Kentucky Class A CDL applicants answer 20 Combination Vehicles questions and must score at least 80% correct. Study Kentucky CDL Manual Section 6 closely: rollover risk, crack-the-whip, stopping distance, trailer skids, off-tracking, wide turns, backing, trailer hand valve limits, red emergency and blue service lines, glad hands, crossed-line checks, fifth wheel coupling, kingpin and jaw inspection, landing gear, chocks, air-flow tests, tractor protection valve, emergency brakes, and service brakes. Kentucky CDL paperwork must be processed before testing, the CLP is valid for six months, and the permit must be held 14 days before skills testing.

Sample Kentucky CDL Combination Practice Questions

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

1For the Kentucky CDL Combination Vehicles test, which statement is correct about Kentucky Class A combination testing?
A.Kentucky Class A applicants answer 20 Combination Vehicles questions.
B.Skip the visual coupling inspection after a successful tug test.
C.Drive at regular speed and fix the issue after the trip.
D.Back under the trailer at an angle to save space.
Explanation: The Kentucky CDL manual lists 20 Combination Vehicles questions for Class A applicants. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
2For the Kentucky CDL Combination Vehicles test, which statement is correct about the passing score?
A.Skip the visual coupling inspection after a successful tug test.
B.Each Kentucky CDL knowledge test requires 80 percent correct.
C.Back under the trailer at an angle to save space.
D.Leave landing gear partly raised so it can clear the trailer nose.
Explanation: Kentucky and FMCSA require at least 80 percent correct on CDL knowledge tests. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
3For the Kentucky CDL Combination Vehicles test, which statement is correct about failed combination knowledge tests?
A.Drive at regular speed and fix the issue after the trip.
B.Back under the trailer at an angle to save space.
C.A failed combination-vehicle knowledge portion blocks Group A CLP or CDL issuance.
D.Close every shut-off valve before moving the combination.
Explanation: 49 CFR 383.135 says an applicant who fails the combination portion must not receive a Group A CLP or CDL. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
4For the Kentucky CDL Combination Vehicles test, which statement is correct about Class A weight thresholds?
A.Back under the trailer at an angle to save space.
B.Leave landing gear partly raised so it can clear the trailer nose.
C.Close every shut-off valve before moving the combination.
D.Class A covers qualifying combinations of 26,001 pounds or more when the towed unit is over 10,000 pounds GVWR.
Explanation: KYTC and FMCSA use the 26,001-pound combination threshold with a towed unit over 10,000 pounds. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
5For the Kentucky CDL Combination Vehicles test, which statement is correct about Kentucky CDL testing?
A.Kentucky State Police conducts CDL permit and license testing.
B.Close every shut-off valve before moving the combination.
C.Swing left before starting every right turn so traffic sees you.
D.Use actual loaded weight instead of GVWR or GCWR for CDL class decisions.
Explanation: KSP says it is responsible for CDL permit and license testing. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
6For the Kentucky CDL Combination Vehicles test, which statement is correct about KYTC paperwork?
A.Close every shut-off valve before moving the combination.
B.CDL paperwork includes the Medical Certificate, Self-Certification, and Commercial application.
C.Use actual loaded weight instead of GVWR or GCWR for CDL class decisions.
D.Use the trailer hand valve for normal braking while driving.
Explanation: KYTC lists those documents as required CDL paperwork. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
7For the Kentucky CDL Combination Vehicles test, which statement is correct about Kentucky permit validity?
A.Swing left before starting every right turn so traffic sees you.
B.Use actual loaded weight instead of GVWR or GCWR for CDL class decisions.
C.A Kentucky CDL instruction permit is valid for six months.
D.Skip the visual coupling inspection after a successful tug test.
Explanation: The Kentucky CDL manual states that the instruction permit is valid for six months. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
8For the Kentucky CDL Combination Vehicles test, which statement is correct about skills-test waiting period?
A.Use actual loaded weight instead of GVWR or GCWR for CDL class decisions.
B.Use the trailer hand valve for normal braking while driving.
C.Skip the visual coupling inspection after a successful tug test.
D.A Kentucky CDL permit must be held 14 days before skills testing.
Explanation: Kentucky requires the permit to be held 14 days before skills testing. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
9For the Kentucky CDL Combination Vehicles test, which statement is correct about knowledge-test retesting?
A.A failed Kentucky CDL knowledge test requires a 24-hour wait before retesting.
B.Skip the visual coupling inspection after a successful tug test.
C.Drive at regular speed and fix the issue after the trip.
D.Back under the trailer at an angle to save space.
Explanation: The Kentucky CDL manual states that failed knowledge tests require a 24-hour wait. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.
10For the Kentucky CDL Combination Vehicles test, which statement is correct about combination retest fees?
A.Skip the visual coupling inspection after a successful tug test.
B.Kentucky charges a $5 retest fee after the initial failure for combination, air brake, and endorsement tests.
C.Back under the trailer at an angle to save space.
D.Leave landing gear partly raised so it can clear the trailer nose.
Explanation: The Kentucky CDL manual identifies that $5 retest fee. Source basis: Kentucky CDL Manual Section 6, KYTC CDL guidance, KSP driver testing guidance, FMCSA CDL standards, and 49 CFR Part 383.

About the Kentucky CDL Combination Exam

The Kentucky CDL Combination Vehicles Test is the 20-question written knowledge test for Class A commercial driver applicants who need to operate qualifying tractor-trailer and other combination vehicles. Kentucky State Police administers CDL testing, KYTC manages licensing requirements and fees, and FMCSA Part 383 supplies federal Group A, required-knowledge, and 80% passing-score standards. The tested knowledge comes from Kentucky CDL Manual Section 6: safe operation of combinations, rollover and rearward amplification, braking early, railroad-crossing clearance, trailer skids and jackknife recovery, off-tracking, wide turns, backing, trailer air lines, glad hands, trailer air supply controls, ABS, coupling, uncoupling, fifth wheel and kingpin checks, landing gear, wheel chocks, and combination inspections.

Assessment

Kentucky State Police-administered multiple-choice CDL knowledge test for Class A applicants. The Kentucky CDL manual lists 20 Combination Vehicles questions, separate from the 50-question General Knowledge test and from Air Brakes or endorsement tests.

Time Limit

No separate Kentucky time limit is published for the Combination Vehicles written knowledge test

Passing Score

80% correct on each CDL knowledge test

Exam Fee

$11 standard commercial permit plus $24 application fee; $5 retest fee after the initial failure for combination, air brake, and endorsement tests; CDL costs vary by class, endorsements, attempts, and REAL ID choice (Kentucky Transportation Cabinet (KYTC) / Kentucky State Police (KSP))

Kentucky CDL Combination Exam Content Outline

Core section

Driving Combination Vehicles Safely

Rollover risk, high center of gravity, rearward amplification, crack-the-whip, following distance, braking early, bobtail stopping, railroad-crossing clearance, off-tracking, wide turns, and backing.

Core section

Combination Vehicle Air Brakes

Trailer hand valve, tractor protection valve, red trailer air supply control, service and emergency lines, glad hands, crossed lines, trailer tanks, shut-off valves, ABS, and trailer brake checks.

Core section

Coupling and Uncoupling

Fifth wheel inspection, trailer height, kingpin alignment, air and electrical line connection, trailer brake test, tug test, visual jaw check, landing gear, chocks, and safe uncoupling sequence.

Core section

Inspecting Combination Vehicles

Lower and upper fifth wheel, kingpin, locking jaws, release arm, safety latch, air and electric lines, landing gear clearance, air-flow test, tractor protection valve, emergency brakes, and service brakes.

State/federal logistics

Kentucky CDL and FMCSA Rules

Kentucky Class A threshold, KSP testing role, KYTC paperwork, permit validity, 14-day skills-test waiting period, fees, 24-hour retest wait, $5 retest fee, and 49 CFR Part 383 standards.

How to Pass the Kentucky CDL Combination Exam

What You Need to Know

  • Passing score: 80% correct on each CDL knowledge test
  • Assessment: Kentucky State Police-administered multiple-choice CDL knowledge test for Class A applicants. The Kentucky CDL manual lists 20 Combination Vehicles questions, separate from the 50-question General Knowledge test and from Air Brakes or endorsement tests.
  • Time limit: No separate Kentucky time limit is published for the Combination Vehicles written knowledge test
  • Exam fee: $11 standard commercial permit plus $24 application fee; $5 retest fee after the initial failure for combination, air brake, and endorsement tests; CDL costs vary by class, endorsements, attempts, and REAL ID choice

Keys to Passing

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

Kentucky CDL Combination Study Tips from Top Performers

1Use the official Kentucky CDL manual; Section 6 is the controlling study source for Combination Vehicles.
2Turn the coupling sequence into a checklist: inspect fifth wheel, align tractor, set trailer height, connect lines, charge air, test brakes, lock kingpin, tug test, visual inspection, connect electrical cord, raise landing gear, and remove chocks.
3Memorize red emergency/supply and blue service air-line functions, then practice crossed-line and leak scenarios.
4Study cause and effect: speed plus high center of gravity increases rollover, sudden steering creates crack-the-whip, hard braking can lock trailer wheels, and off-tracking makes trailer wheels cut inside turns.
5Drill inspection language for no fifth wheel gap, jaws around the kingpin shank, release arm seated, safety latch engaged, air/electric lines supported, and landing gear fully raised.
6Before test day, verify current KYTC paperwork, KSP appointment rules, permit fees, retest fees, ELDT status, and medical certification requirements.

Frequently Asked Questions

Who needs the Kentucky CDL Combination Vehicles Test?

Kentucky Class A applicants need Combination Vehicles knowledge testing. The Kentucky CDL manual lists 20 Combination Vehicles questions for applicants for a Class A license.

What score is required to pass?

Kentucky requires 80 percent correct on each CDL knowledge test. Federal rule 49 CFR §383.135 also requires at least 80 percent correct and says a driver who fails the combination-vehicle portion must not be issued a Group A CLP or CDL.

How much does the Kentucky CDL combination process cost?

KYTC 2026 pricing lists an $11 standard commercial permit, $24 application fee, $3 NCIC wants-and-warrants check, prorated CDL add-on fees, and a $5 retest fee after initial failure for combination, air brake, and endorsement tests.

What happens if I fail the Kentucky combination test?

The Kentucky CDL manual says an applicant who fails a knowledge test must wait 24 hours before retesting. Combination, air brake, and endorsement tests require a $5 retest fee for each attempt after the initial failure.

What should I study most?

Focus on Kentucky CDL Manual Section 6: rollover, crack-the-whip, off-tracking, backing, trailer skids, trailer air lines, glad hands, trailer brakes, coupling sequence, fifth wheel and kingpin inspection, landing gear, and combination brake checks.

Is the Combination Vehicles test the same as Air Brakes or Doubles/Triples?

No. Kentucky lists Combination Vehicles, Air Brakes, and endorsements such as Doubles/Triples as separate knowledge-test areas. This practice set avoids air-brakes-only or doubles/triples-only depth except where those topics affect combination-vehicle safety.