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Free Delaware CDL practice test online

Take a free Delaware CDL practice exam online with clear explanations—no sign-up. Coverage includes general knowledge, vehicle systems, combination vehicles, cargo, and endorsements. Then verify current requirements with Delaware Division of Motor Vehicles.

CDL knowledge tests are federally regulated, so the passing score in Delaware is the same as everywhere else: 80% correct on every knowledge test. You must also hold a commercial learner’s permit for 14 days before the skills test.

Start practice Exam-style run

New to the knowledge test? CDL endorsements explained · One-week study plan

Practice coverage
Complete a run to establish your baseline.
600questions
23topics
80%federal pass mark

49 CFR 383.135(a)(1) sets the CDL knowledge-test passing score at 80%. Reaching it here is not a prediction of your official result.

Requirements before you test

Delaware CDL test requirements

80%
Passing score
49 CFR 383.135(a)(1)
14 days
CLP held before skills test
Delaware Division of Motor Vehicles
18
Min. age (in-state)
Delaware Division of Motor Vehicles
21
Min. age (interstate)
49 CFR 391.11(b)(1)

Commercial licensing is largely federal. Any figure above credited to a 49 CFR section applies in every state — see 49 CFR 383.135(a)(1) and 49 CFR 383.25(e). A figure credited to Delaware Division of Motor Vehicles is Delaware’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by Delaware Division of Motor Vehicles (official source).

Entry-Level Driver Training comes first

Since February 7, 2022, a new Class A or Class B CDL, a class upgrade, or a first passenger, school bus, or hazardous materials endorsement requires training from a provider on the FMCSA Training Provider Registry (49 CFR 380.600). Practice questions are study material and do not satisfy that requirement.

FMCSA Training Provider Registry

You need a Delaware licence first

A commercial learner’s permit only counts if you already hold an ordinary licence from the same state (49 CFR 383.25(a)(2)). The Delaware non-commercial knowledge test runs 32 questions and needs 26 correct, with permits issued from age 16.

Delaware permit practice test
Quick practice
10 balanced questions with feedback after every answer.
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Topic review
Focus on one knowledge area before returning to mixed practice.
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Exam-style run
Answer the full starter bank before seeing your results.
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What you will practice

Build coverage topic by topic.

Each question carries a topic, difficulty, explanation, and source section so your review has context.

General knowledge29 reviewed questionsMountain driving12 reviewed questionsAir brakes61 reviewed questionsCombination vehicles54 reviewed questionsVehicle systems9 reviewed questionsCargo18 reviewed questionsTank vehicles47 reviewed questionsDoubles and triples43 reviewed questionsHazardous materials71 reviewed questionsSchool bus48 reviewed questionsPassenger vehicles45 reviewed questionsSafe driving6 reviewed questionsSpace management14 reviewed questionsVehicle inspection15 reviewed questionsEmergencies23 reviewed questionsHours of service14 reviewed questionsBasic control11 reviewed questionsSeeing hazards15 reviewed questionsWeather18 reviewed questionsNight driving7 reviewed questionsDriver fitness8 reviewed questionsSpeed management17 reviewed questionsCommunication15 reviewed questions

Sample questions

5 Delaware CDL practice questions

Try these Delaware sample questions now — each shows the correct answer with a plain-language explanation and a source section. The full 600-question bank is in the practice run.

  1. 1. Federal cargo securement rules require the aggregate working load limit of tiedowns to be at least:

    • AOne-quarter the cargo weight
    • One-half the weight of the article or group secured
    • CEqual to the cargo weight
    • DTwice the cargo weight

    Answer: One-half the weight of the article or group secured. The combined working load limit of the securement system must be at least one-half times the weight of what it holds.

    Source: Commercial Driver License Manual — Transporting cargo — tiedowns

  2. 2. Air-brake lag adds what to total stopping distance?

    • ANothing at highway speed
    • BThe vehicle's height
    • The distance traveled while air moves through the system
    • DOnly tire rotation

    Answer: The distance traveled while air moves through the system. Air brakes take a short time to transmit pressure to the brakes. The vehicle continues moving during that lag.

    Source: Commercial Driver License Manual — Air brakes — stopping distance

  3. 3. A DANGEROUS placard for mixed non-bulk loads cannot replace a specific placard when:

    • ACrossing a state line
    • BThe trailer is empty
    • Enough of one hazard class is aboard that a specific placard is required
    • DDriving at night

    Answer: Enough of one hazard class is aboard that a specific placard is required. Know table thresholds. When in doubt, ask your employer before rolling.

    Source: Commercial Driver License Manual — Hazardous materials — placarding

  4. 4. A bus must carry emergency equipment including a fire extinguisher and:

    • ACargo tiedowns only
    • BA spare fifth wheel
    • Emergency reflectors (such as 3 triangles) or approved flares, and spare fuses unless circuit breakers are fitted
    • DOnly a first-aid chart

    Answer: Emergency reflectors (such as 3 triangles) or approved flares, and spare fuses unless circuit breakers are fitted. Reflective triangles or approved flares are required so you can warn traffic if you stop.

    Source: Commercial Driver License Manual — Passenger vehicles — vehicle inspection

  5. 5. Before disconnecting the air lines while uncoupling, you should:

    • Chock the trailer wheels or ensure its brakes are holding
    • BRelease the fifth-wheel lock
    • CDrain the trailer air tank
    • DRaise the landing gear

    Answer: Chock the trailer wheels or ensure its brakes are holding. Once the emergency line is disconnected the trailer relies on its spring brakes. Chocks stop it rolling if that pressure has bled away.

    Source: Commercial Driver License Manual — Combination vehicles — uncoupling

Practice all 600 questions

CDL knowledge areas

Classes and endorsements, organized.

Each area below scopes the reviewed question bank to one knowledge test. The material is federal, so it applies in Delaware just like everywhere else — the endorsement guide explains how the codes fit together.

General knowledge

The foundation for commercial driving: inspections, space, speed, communication, hazards, and safe operation.

  • Pre-trip inspection
  • Space and speed management
  • Railroad crossings
  • Emergency procedures
Practice general knowledge
Air brakes

Understand air-brake components, inspections, warning devices, stopping distance, and controlled braking.

  • Dual air systems
  • Low-air warnings
  • Brake lag and fade
  • Applied-leak and static checks
Practice air brakes
Combination vehicles

Prepare for safe coupling, inspection, turning, backing, and handling of tractor-trailer combinations.

  • Fifth-wheel inspection
  • Coupling and uncoupling
  • Off-tracking
  • Trailer skid prevention
Practice combination vehicles
Hazardous materialsEndorsement H

Study hazard communication, shipping papers, placards, loading rules, parking, and emergency response responsibilities.

  • Hazard classes
  • Placards and labels
  • Shipping papers
  • Loading and segregation
Practice hazardous materials
Tank vehiclesEndorsement N

Learn how liquid surge, outage, bulkheads, and high centers of gravity change vehicle handling.

  • Liquid surge
  • Outage requirements
  • Smooth braking
  • Rollover prevention
Practice tank vehicles
Doubles & triplesEndorsement T

Practice converter-dolly inspection, coupling order, rearward amplification, and stability principles.

  • Coupling sequence
  • Converter dollies
  • Rearward amplification
  • Space management
Practice doubles & triples
Passenger vehiclesEndorsement P

Prepare to inspect, load, and operate buses while keeping passengers, aisles, and exits safe.

  • Vehicle inspection
  • Passenger loading
  • Emergency exits
  • Prohibited practices
Practice passenger vehicles
School busEndorsement S

Review student loading, danger zones, mirrors, emergency procedures, and special railroad-crossing duties.

  • Danger zones
  • Student loading
  • Mirror use
  • Railroad crossings
Practice school bus
Official source hub
Verify current rules before your test.

QuizLane’s starter material points learners back to the agency responsible for licensing in Delaware. Rules and manuals can change; the official agency remains authoritative.

Visit Delaware Division of Motor Vehicles
Our accuracy promise
Original wording—not scraped competitor questions
A source section attached to every reviewed item
A correction path when something looks wrong
Read our methodology

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Common questions

What this practice can—and cannot—tell you.