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300+ Free Delaware CDL General Knowledge Practice Questions

Pass your Delaware Commercial Driver License General Knowledge Test exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: Delaware CDL General Knowledge Exam

80%

Minimum passing score for CDL knowledge tests

FMCSA / 49 CFR 383.135

At least 30

Minimum basic knowledge-test items

FMCSA States CDL Knowledge & Skills Test

20

General knowledge areas for CMV operators

49 CFR 383.111(a)

$5

Delaware CLP issuance fee

Delaware DMV CDL page

1 year

Delaware CLP validity period

Delaware DMV CDL page

14 days

Minimum CLP hold before Delaware CDL skills test

Delaware DMV CDL page

Delaware CDL applicants take walk-in CDL knowledge tests at DMV division facilities. Delaware requires General Knowledge at minimum before CLP issuance, and the CLP is valid for one year with a $5 issuance fee. FMCSA sets the minimum General Knowledge framework: 20 knowledge areas, at least 30 items, and an 80% passing score. Use the Delaware Commercial Driver License Manual first, then add separate air-brake, combination-vehicle, or endorsement study if those tests apply.

Sample Delaware CDL General Knowledge Practice Questions

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

1When performing a pre-trip inspection, the driver should ensure that the steering wheel free play (lash) does not exceed what limit?
A.5 degrees in either direction
B.10 degrees in either direction (approximately 2 inches on a 20-inch wheel)
C.15 degrees in either direction
D.20 degrees in either direction
Explanation: Federal Motor Carrier Safety Regulations require that steering wheel free play (lash) not exceed 10 degrees in either direction, which translates to roughly 2 inches of movement on a 20-inch diameter steering wheel before the front wheels begin to turn. Excessive free play indicates worn steering components and can make precise steering difficult, especially in emergency maneuvers. A vehicle with excessive steering lash would be placed out of service.
2During the cab check portion of a pre-trip inspection, you should test the parking brake by:
A.Driving forward slowly and applying the parking brake
B.Putting the vehicle in gear with the parking brake set and gently pressing the accelerator to see if the vehicle holds
C.Visually checking that the parking brake handle is in the correct position
D.Checking the parking brake cable under the vehicle
Explanation: To properly test the parking brake, set the parking brake, put the vehicle in a low gear, and gently press the accelerator to see if the brake holds the vehicle in place. This functional test confirms the parking brake can actually prevent the vehicle from moving, which is essential for safety when parked on grades. A visual check alone is insufficient because it does not verify that the brake mechanism is actually functioning properly.
3Which emergency equipment is required to be on a commercial motor vehicle?
A.Fire extinguisher, spare fuses, and three red reflective triangles
B.First aid kit, fire extinguisher, and flares only
C.Fire extinguisher and road flares only
D.Spare tire, jack, and reflective vest
Explanation: Federal regulations require every commercial motor vehicle to carry a properly charged and rated fire extinguisher (minimum 5 B:C rating, or two 4 B:C extinguishers), spare electrical fuses (unless the vehicle has circuit breakers), and three red reflective warning triangles (or equivalent). These items are checked during inspections and roadside enforcement stops. A vehicle missing any of these required items can be cited for a violation.
4A post-trip inspection report is important because:
A.It is only required for vehicles carrying hazardous materials
B.It alerts the carrier to vehicle defects that may need repair before the vehicle is driven again
C.It replaces the need for the next driver to do a pre-trip inspection
D.It is optional but recommended by the FMCSA
Explanation: The post-trip inspection report (also called a DVIR, or Driver Vehicle Inspection Report) is required by FMCSA regulations (49 CFR 396.11). Its purpose is to document any defects or deficiencies discovered at the end of the trip so the carrier can arrange repairs before the vehicle is dispatched again. The next driver must review the previous post-trip report and verify that any noted defects have been repaired or certified as not needing repair. It does not replace the next driver's pre-trip inspection obligation.
5During a pre-trip inspection, the driver notices a coolant leak near the water pump. What should the driver do?
A.Note it on the report and drive carefully to the next service stop
B.Add more coolant and continue the trip
C.Do not drive the vehicle until the leak is repaired
D.Drive only short distances and monitor the temperature gauge
Explanation: A coolant leak is a serious defect that can lead to engine overheating and catastrophic engine failure. The vehicle should not be driven until the leak is repaired. Driving with a coolant leak risks engine damage, potential fire (if coolant contacts hot exhaust components), and could result in a roadside breakdown in an unsafe location. FMCSA regulations require that defects affecting safe operation be corrected before the vehicle is driven.
6Which of the following is an out-of-service condition that would prevent a vehicle from being driven?
A.A small crack in the windshield that does not obstruct the driver's view
B.A missing mud flap on a rear wheel
C.Brake lining thickness below the minimum allowed by regulations
D.A broken antenna on the CB radio
Explanation: Brake lining worn below the minimum thickness specified in FMCSA out-of-service criteria is a critical safety defect. The North American Standard Out-of-Service Criteria lists specific thresholds: brake lining must not be less than 1/4 inch thick at the thinnest point for air-braked vehicles. When brake linings are too thin, braking effectiveness is severely compromised, and the vehicle must be placed out of service until repairs are made. A small windshield crack not in the driver's view, a missing mud flap, or a broken CB antenna are defects but not typically out-of-service conditions.
7During the pre-trip inspection, which of the following should a driver check regarding the exhaust system?
A.Only that the muffler is present
B.That the exhaust system is secure, not leaking, and not in contact with fuel lines, wiring, or air lines
C.Only that exhaust fumes are not entering the cab
D.That the catalytic converter is functioning properly by checking emissions color
Explanation: When inspecting the exhaust system, the driver should verify that all components are properly mounted and secured, there are no leaks (which could allow poisonous carbon monoxide to enter the cab), and the exhaust system is not in contact with fuel supply lines, wiring, or air brake lines. Heat from the exhaust can damage these components, potentially causing fuel leaks, electrical fires, or brake failures. A complete exhaust system inspection goes beyond just checking for the presence of a muffler.
8What is the minimum tread depth required for steer axle tires on a commercial motor vehicle?
A.2/32 of an inch
B.4/32 of an inch
C.6/32 of an inch
D.1/32 of an inch
Explanation: Federal regulations require steer axle tires to have a minimum tread depth of 4/32 of an inch (approximately 3.2 mm) in every major groove. Steer tires have a higher minimum than other axle positions (which require only 2/32 of an inch) because the steer tires are critical for directional control of the vehicle. Tires below this minimum are considered unsafe and will result in a violation or out-of-service order during an inspection.
9What is the minimum tread depth required for tires on drive and trailer axle positions?
A.4/32 of an inch
B.2/32 of an inch
C.6/32 of an inch
D.1/32 of an inch
Explanation: Tires on drive axles and trailer axles must have a minimum tread depth of 2/32 of an inch in every major tread groove. This is less than the 4/32-inch requirement for steer axle tires because drive and trailer tires, while important for traction and braking, are not as critical for directional control as steer tires. However, insufficient tread on any axle reduces traction, increases stopping distance, and raises the risk of hydroplaning on wet roads.
10When inspecting slack adjusters on an S-cam brake system, the pushrod stroke at the brake chamber should not exceed what general limit?
A.1/2 inch
B.1 inch
C.The adjustment limit varies by chamber size, but generally should not exceed about 2 inches
D.4 inches
Explanation: The maximum allowable pushrod stroke depends on the specific brake chamber size (type 16, 20, 24, 30, etc.), but as a general rule, pushrod travel should not exceed approximately 2 inches for most common chamber sizes. When pushrod travel is excessive, the brakes are out of adjustment and will not provide adequate stopping power. Specifically, a type 30 long-stroke chamber has a maximum of 2.5 inches. Checking slack adjuster stroke is a critical part of the brake inspection because out-of-adjustment brakes are one of the most common out-of-service violations found during roadside inspections.

About the Delaware CDL General Knowledge Exam

The Delaware CDL General Knowledge Test is the required foundation knowledge exam for Delaware commercial learner permit and commercial driver license applicants. Delaware DMV states that every CDL applicant completes General Knowledge at minimum, with additional class or endorsement testing depending on the vehicle and operation. FMCSA requires each basic knowledge test to cover the 20 general areas in 49 CFR 383.111(a), include at least 30 items, and require at least 80% correct to pass. This practice bank follows Delaware DMV and FMCSA source areas: inspection, basic control, shifting, speed and space, seeing and communication, adverse conditions, emergencies and skids, railroad crossings, mountain driving, cargo securement, fatigue, alcohol and drug rules, medical qualification, ELDT, and CDL licensing basics.

Assessment

Multiple-choice CDL knowledge test covering the basic general-knowledge areas required for commercial motor vehicle operators; air brakes, combination vehicles, and endorsements may require separate knowledge tests depending on the license sought.

Time Limit

No separate official time limit published by Delaware DMV or FMCSA for the General Knowledge test

Passing Score

At least 80% correct on each CDL knowledge test under FMCSA standards

Exam Fee

$5 commercial learner permit issuance fee; Delaware DMV does not publish a separate General Knowledge-only test fee (Delaware Division of Motor Vehicles)

Delaware CDL General Knowledge Exam Content Outline

Core general-knowledge area

Vehicle Inspection

Pre-trip, en-route, and post-trip inspections; steering, suspension, brakes, tires, wheels, lights, mirrors, emergency equipment, leaks, and defect reporting.

Core general-knowledge area

Basic Vehicle Control

Starting, steering, shifting, backing, turning, off-tracking, controlling speed on curves and grades, and avoiding unsafe maneuvers in large CMVs.

Core general-knowledge area

Speed and Space Management

Stopping distance, following distance, side and rear space, overhead clearance, merging gaps, curves, intersections, railroad crossings, and safe speed choices.

Core general-knowledge area

Seeing, Communication, and Hazards

Scanning ahead, mirror checks, communicating with signals and horn when appropriate, recognizing distracted or aggressive drivers, and planning escape routes.

Core general-knowledge area

Night and Adverse Conditions

Night visibility, headlight limits, fog, rain, hydroplaning, black ice, snow, hot-weather tire concerns, crosswinds, and reduced-speed decisions.

Core general-knowledge area

Emergencies, Skids, and Mountain Driving

Brake failure, blowouts, tire and engine fires, crash procedures, evasive steering, skid recovery, escape ramps, downgrades, safe gear choice, and brake fade.

Core general-knowledge area

Cargo Securement and Weight

Cargo inspection intervals, tie-down principles, blocking and bracing, working load limits, sealed loads, load distribution, GVWR/GCWR, axle limits, and overweight permits.

Core general-knowledge area

Driver Wellness, Fatigue, Alcohol, and Drugs

Fatigue warning signs, rest as the only reliable cure for drowsiness, drug and alcohol testing, 0.04 CMV BAC standard, and disqualifying offenses.

Core general-knowledge area

Delaware and FMCSA CDL Basics

CDL classes, Delaware CLP procedures, walk-in knowledge testing, CLP validity, medical qualification, ELDT, CDLIS checks, disqualifications, and FMCSA minimum test standards.

How to Pass the Delaware CDL General Knowledge Exam

What You Need to Know

  • Passing score: At least 80% correct on each CDL knowledge test under FMCSA standards
  • Assessment: Multiple-choice CDL knowledge test covering the basic general-knowledge areas required for commercial motor vehicle operators; air brakes, combination vehicles, and endorsements may require separate knowledge tests depending on the license sought.
  • Time limit: No separate official time limit published by Delaware DMV or FMCSA for the General Knowledge test
  • Exam fee: $5 commercial learner permit issuance fee; Delaware DMV does not publish a separate General Knowledge-only test fee

Keys to Passing

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

Delaware CDL General Knowledge Study Tips from Top Performers

1Use the Delaware Commercial Driver License Manual as the primary source before drilling practice questions.
2Start with inspection, basic control, speed, space, and hazard perception because those topics drive many General Knowledge scenarios.
3Learn the numbers that appear in official CDL material: following distance rules, inspection intervals, CLP validity, 14-day CLP hold, and the 80% passing score.
4Separate General Knowledge from extra tests: air brakes, combination vehicles, and endorsements require additional preparation when they apply.
5Review every missed question by topic and return to the matching Delaware manual section instead of memorizing only answer text.
6Confirm current documents, medical certification procedures, ELDT status, and DMV office testing logistics on Delaware DMV pages before visiting.

Frequently Asked Questions

Who administers the Delaware CDL General Knowledge Test?

The Delaware Division of Motor Vehicles administers CDL knowledge testing. Delaware DMV states that CDL knowledge tests are walk-in only and can be completed at any division facility.

How many questions are on the Delaware CDL General Knowledge Test?

FMCSA requires each basic CDL knowledge test to contain at least 30 items. Delaware DMV does not publish a separate General Knowledge item count on its CDL page, so applicants should treat 30 as the federal minimum and verify current office procedures with DMV before testing.

What score do I need to pass?

FMCSA requires CDL applicants to correctly answer at least 80% of the questions on each CDL knowledge test, including general and endorsement knowledge tests.

How much does the Delaware CLP cost?

Delaware DMV states that a $5 fee is required when a CDL learner permit is issued. DMV does not publish a separate General Knowledge-only test fee on the CDL page.

How long is a Delaware CDL learner permit valid?

Delaware DMV states that a CDL learner permit is valid for one year and may not be issued or extended beyond one year from the original permit issuance date.

Do I need ELDT before taking the Delaware General Knowledge test?

General Knowledge can be part of the CLP process, but Delaware DMV explains that ELDT is required before the CDL skills test for first-time Class A or B applicants and certain upgrades or endorsements. HazMat ELDT is required before the H endorsement knowledge test.