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300+ Free TX CDL Doubles and Triples Practice Questions

Pass your Texas CDL Doubles and Triples Endorsement Test exam on the first try — instant access, no signup required.

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How many axles does a typical converter dolly have?

A
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Key Facts: TX CDL Doubles and Triples Exam

Knowledge test

Federal test required for Double/Triple Trailers endorsement

49 CFR §383.93

80%

Minimum correct score required for CDL knowledge tests

49 CFR §383.135

180 days

Texas CLP validity, or until base license expiration if earlier

Texas DPS CDL application page and Driver License Fees

$25

Texas DPS original Commercial Learners Permit fee

Texas DPS Driver License Fees

Study Texas Commercial Motor Vehicle Drivers Handbook Section 7 for converter dolly procedures, coupling and uncoupling order, air/electric line checks, shut-off valve positions, fifth-wheel and kingpin checks, heaviest-trailer placement, rollover prevention, rearward amplification, and emergency handling. Federal 49 CFR 383.93 requires a knowledge test for the Double/Triple Trailers endorsement, 49 CFR 383.115 defines required knowledge areas, and 49 CFR 383.135 sets the 80% knowledge-test passing standard. Texas DPS lists a $25 original CLP fee and $97 standard new CDL fee for ages 18 to 84, but does not publish a separate doubles/triples-only first-attempt fee.

Sample TX CDL Doubles and Triples Practice Questions

Try these sample questions to test your TX CDL Doubles and Triples exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 300+ question experience with AI tutoring.

1What Texas CDL endorsement covers double and triple trailer combinations where lawful?
A.T endorsement
B.A passenger endorsement only
C.A cargo paperwork shortcut
D.An action not supported by DPS Section 7
Explanation: The T endorsement is the CDL endorsement for double/triple trailers under federal CDL endorsement rules. Texas DPS administers endorsement knowledge testing under FMCSA standards.
2Which federal rule lists required doubles/triples knowledge areas?
A.A passenger endorsement only
B.A cargo paperwork shortcut
C.An action not supported by DPS Section 7
D.49 CFR 383.115
Explanation: 49 CFR 383.115 identifies the knowledge areas for double/triple trailer endorsement applicants. It includes hookup, heaviest-trailer placement, handling, stability, traffic issues, and operating practices.
3What minimum score is required on CDL knowledge tests?
A.A cargo paperwork shortcut
B.An action not supported by DPS Section 7
C.80 percent correct
D.A passenger endorsement only
Explanation: 49 CFR 383.135 requires at least 80 percent correct on each CDL knowledge test. Texas CDL knowledge testing follows the federal standard.
4Which endorsement is allowed on a CLP under federal rules?
A.An action not supported by DPS Section 7
B.Tank vehicle endorsement
C.A passenger endorsement only
D.A cargo paperwork shortcut
Explanation: Federal rules allow only Passenger, School Bus, and Tank Vehicle endorsements on a CLP. The doubles/triples T endorsement is a CDL endorsement.
5How long does Texas DPS say a Texas CLP is valid?
A.180 days or until the base Texas driver license expires, whichever is earliest
B.A passenger endorsement only
C.A cargo paperwork shortcut
D.An action not supported by DPS Section 7
Explanation: Texas DPS states that a CLP is valid for 180 days or until the base driver license expires, whichever is earliest. A required CLP must also be held 14 days before skills testing.
6What fee does Texas DPS list for an original Commercial Learners Permit?
A.A passenger endorsement only
B.A cargo paperwork shortcut
C.An action not supported by DPS Section 7
D.$25
Explanation: Texas DPS Driver License Fees list an original CLP at $25. DPS does not publish a separate doubles/triples-only first-attempt fee.
7Which statement about ELDT and adding only T is most accurate?
A.A cargo paperwork shortcut
B.An action not supported by DPS Section 7
C.FMCSA/Texas DPS do not list T alone as a separate ELDT trigger
D.A passenger endorsement only
Explanation: Texas DPS lists ELDT triggers for first-time CDL, upgrades, and new hazmat, passenger, or school bus endorsements. Adding doubles/triples still requires the knowledge test.
8Which official Texas handbook section covers doubles and triples?
A.An action not supported by DPS Section 7
B.Texas Commercial Motor Vehicle Drivers Handbook Section 7
C.A passenger endorsement only
D.A cargo paperwork shortcut
Explanation: Texas DPS Section 7 covers doubles/triples operation. It is the official Texas study source for converter dollies, coupling, inspection, rollover, and emergency handling.
9What is converter gear on a dolly?
A.A coupling device with one or two axles and a fifth wheel
B.A passenger endorsement only
C.A cargo paperwork shortcut
D.An action not supported by DPS Section 7
Explanation: Texas DPS describes converter gear as dolly-mounted equipment with one or two axles and a fifth wheel. It lets a semitrailer be coupled behind a tractor-trailer combination.
10Where should the heavier semitrailer be placed for safest double-trailer handling?
A.A passenger endorsement only
B.A cargo paperwork shortcut
C.An action not supported by DPS Section 7
D.First position behind the tractor
Explanation: Texas DPS Section 7 says the more heavily loaded semitrailer should be first behind the tractor. The lighter trailer should be in the rear.

About the TX CDL Doubles and Triples Exam

The Texas CDL Doubles and Triples Endorsement Test is the DPS knowledge test used to add the T endorsement for double/triple trailer operations where lawful. Texas Commercial Motor Vehicle Drivers Handbook Section 7 covers safe operation, converter dollies, coupling, uncoupling, inspections, air and electrical lines, rollover prevention, rearward amplification, crack-the-whip effect, traffic-space problems, and emergency control. FMCSA Part 383 supplies the federal endorsement framework, including the knowledge-test requirement and required knowledge areas.

Assessment

20-question CDL endorsement knowledge-test format for doubles/triples study, covering Texas Commercial Motor Vehicle Drivers Handbook Section 7 and federal double/triple trailers endorsement knowledge areas; Texas DPS confirms the doubles/triples test is required but does not publish a separate public question-count page for this endorsement.

Time Limit

Texas DPS does not publish a separate fixed public time limit for the Doubles/Triples endorsement knowledge test

Passing Score

80% minimum correct on CDL knowledge tests under 49 CFR §383.135

Exam Fee

$25 original CLP when required; $97 standard new Texas CDL for ages 18 to 84 when issued; no separate DPS-published doubles/triples-only first-attempt fee found (Texas Department of Public Safety (DPS) under FMCSA CDL standards)

TX CDL Doubles and Triples Exam Content Outline

10%

Endorsement Basics and Texas Logistics

T endorsement purpose, Texas CDL application logistics, CLP term and holding period, federal CLP endorsement limits, ELDT scope, DPS fees, and the 80% federal passing standard.

25%

Converter Dolly and Coupling

Converter gear definition, pintle hook, safety chains, dolly support, rear trailer securement, heaviest-trailer placement, dolly positioning, trailer height, fifth-wheel lock checks, tug tests, and rear trailer air checks.

15%

Uncoupling Procedures

Firm level ground, straight-line parking, parking brakes, wheel chocks, landing gear, air shut-off valves, dolly line securement, dolly control, rear-trailer separation, and pintle-hook release safety.

20%

Inspection and Air/Electric Systems

Fifth wheels, kingpins, landing gear, sliding components, shut-off valves, converter dolly drain valves, glad hands, service and emergency lines, line slack, ABS lamps, pintle-eye, safety chains, and lighting.

30%

Stability, Space, Speed, and Emergencies

Rollover prevention, crack-the-whip effect, rearward amplification, off-tracking, following distance, passing and freeway-entry space, route planning, adverse conditions, sway response, tire failure, jackknife prevention, and post-emergency inspection.

How to Pass the TX CDL Doubles and Triples Exam

What You Need to Know

  • Passing score: 80% minimum correct on CDL knowledge tests under 49 CFR §383.135
  • Assessment: 20-question CDL endorsement knowledge-test format for doubles/triples study, covering Texas Commercial Motor Vehicle Drivers Handbook Section 7 and federal double/triple trailers endorsement knowledge areas; Texas DPS confirms the doubles/triples test is required but does not publish a separate public question-count page for this endorsement.
  • Time limit: Texas DPS does not publish a separate fixed public time limit for the Doubles/Triples endorsement knowledge test
  • Exam fee: $25 original CLP when required; $97 standard new Texas CDL for ages 18 to 84 when issued; no separate DPS-published doubles/triples-only first-attempt fee found

Keys to Passing

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

TX CDL Doubles and Triples Study Tips from Top Performers

1Memorize the coupling order: secure the rear trailer, place the heaviest trailer first, position and secure the dolly, couple and verify the fifth wheel, connect lines, open correct intermediate shut-off valves, and confirm air at the rear trailer.
2Drill shut-off valve positions: valves at the rear of the front trailer open, valves at the rear of the last trailer closed, and converter dolly drain valve closed for operation.
3Use inspection questions as a checklist for fifth wheels, kingpins, pintle hook, pintle-eye, safety chains, air/electric lines, landing gear, dolly tires, ABS lamps, and rear trailer lights.
4Treat rollover and crack-the-whip questions as smooth-control questions: slow before curves, steer gently, avoid sudden braking, and maintain extra space.
5Know Texas logistics: Texas DPS uses CLP/CDL transaction fees, a 180-day CLP term, a 14-day CLP holding period before skills testing when required, and federal 80% knowledge-test scoring.

Frequently Asked Questions

What is the Texas CDL Doubles and Triples endorsement?

It is the T endorsement for operating double/triple trailer combinations where lawful. Federal 49 CFR 383.93 requires a specialized knowledge test for this endorsement.

What should I study for the Texas doubles/triples test?

Study Texas Commercial Motor Vehicle Drivers Handbook Section 7, plus related combination-vehicle and air-brake concepts. Federal 49 CFR 383.115 requires knowledge of assembly and hookup, heaviest-trailer placement, handling and stability, traffic-operation problems, and operating practices.

What score do I need to pass?

Federal CDL rules require at least 80% correct on knowledge tests under 49 CFR 383.135.

Can the T endorsement be placed on a Texas CLP?

Federal 49 CFR 383.93 limits CLP endorsements to Passenger, School Bus, and Tank Vehicle. The doubles/triples T endorsement is a CDL endorsement.

How much does the Texas doubles/triples endorsement test cost?

Texas DPS publishes CDL/CLP transaction fees rather than a separate doubles/triples-only first-attempt fee. DPS lists a $25 original CLP fee and a $97 standard new CDL fee for ages 18 to 84 when issued.