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300+ Free WI CDL General Knowledge Practice Questions

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

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During a roadside inspection, an officer finds that a CMV has an air brake system where the air compressor takes more than 3 minutes to build pressure from 85 to 100 psi. What does this indicate?

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2026 Statistics

Key Facts: WI CDL General Knowledge Exam

50

Wisconsin B/C General Knowledge questions

WisDOT Requirement to Obtain a CDL

80%

Minimum passing score

WisDOT and 49 CFR 383.135

$0

Wisconsin CDL knowledge-test fee

WisDOT DMV Fees

$30

Wisconsin CLP fee

WisDOT DMV Fees

180 days

Wisconsin CLP validity

WisDOT CDL requirements and CDL Manual

Wisconsin CDL applicants must pass General Knowledge before obtaining a CLP. WisDOT lists B/C General Knowledge as 50 questions from CDL Manual Sections 1-3, says CDL knowledge tests are free and generally take 1 to 1.5 hours, and requires 80% or more correct answers. A Wisconsin CLP costs $30, is valid for 180 days, and must be held at least 14 days before skills testing.

Sample WI CDL General Knowledge Practice Questions

Try these sample questions to test your WI 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.

1What is the first step in the seven-step pre-trip inspection method?
A.Approach the vehicle and check its general condition
B.Check under the hood
C.Start the engine and inspect inside the cab
D.Walk around and inspect the entire vehicle
Explanation: The first step of the seven-step pre-trip inspection is to approach the vehicle and look at its general condition. This includes checking for damage, whether the vehicle is leaning to one side, and looking under the vehicle for fresh leaks of oil, coolant, grease, or fuel. This initial overview can immediately reveal serious problems before you invest time in a detailed inspection.
2During a pre-trip inspection, what should you check in the engine compartment?
A.Only the oil level
B.Oil level, coolant level, power steering fluid, belts, and hoses
C.Only the coolant level and belts
D.Only items visible without opening any caps
Explanation: A thorough engine compartment inspection includes checking the oil level, coolant level in the radiator, power steering fluid, condition of belts and hoses for wear or cracks, and looking for leaks. You should also check the alternator, water pump, air compressor, and any other belt-driven components. Checking only one or two items could mean missing a critical problem that leads to a breakdown or safety hazard on the road.
3When 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.
4During 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.
5Which 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.
6A 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.
7During 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.
8Which 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.
9During 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.
10What 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.

About the WI CDL General Knowledge Exam

The Wisconsin CDL General Knowledge Test is the required core knowledge exam for Wisconsin commercial learner permit and CDL applicants. WisDOT directs applicants to study the Wisconsin Commercial Driver Manual, says all CDL applicants must pass General Knowledge, lists B/C General Knowledge as a 50-question test from Sections 1-3, and sets 80% or more correct answers as passing. FMCSA standards require state CDL knowledge tests to cover the general CMV safety areas in 49 CFR 383.111, including safe operations, vehicle control, inspection, seeing, communication, speed and space management, night and adverse-condition driving, hazards, emergencies, skid recovery, cargo securement, mountain driving, fatigue, and alcohol/drug effects.

Assessment

Multiple-choice CDL knowledge test. Wisconsin lists B/C General Knowledge as 50 questions from CDL Manual Sections 1-3; Class A, air brakes, and endorsements require additional tests when applicable.

Time Limit

WisDOT says CDL knowledge tests take at least 1 to 1.5 hours; no appointment is necessary for knowledge tests.

Passing Score

80% or more correct answers

Exam Fee

$0 knowledge test; $30 CLP valid 180 days; $74 original Class A/B/C CDL (Wisconsin Department of Transportation Division of Motor Vehicles)

WI CDL General Knowledge Exam Content Outline

Core section

Vehicle Inspection and Safety Equipment

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

Core section

Basic Vehicle Control

Starting, stopping, shifting, backing, turning, off-tracking, countersteering, curves, ramps, overhead clearance, and vehicle control under load.

Core section

Seeing, Communication, Speed, and Space

Looking 12-15 seconds ahead, mirror checks, signaling, following distance, stopping distance, side space, merging gaps, work zones, and railroad crossings.

Core section

Night, Weather, Mountains, and Emergencies

Low/high beams, fog, rain, snow, ice, black ice, hot weather, crosswinds, hydroplaning, downgrades, brake failure, blowouts, fire, skids, and crash response.

Core section

Cargo and Weight Management

Cargo securement, tie-down checks, blocking and bracing, load shift, sealed loads, weight distribution, axle/GVWR/GCWR limits, and inspection intervals.

Licensing section

Wisconsin CDL and FMCSA Rules

Wisconsin test logistics, 50-question General Knowledge format, 80% passing score, CLP validity, 14-day CLP hold, ELDT, medical certification, and alcohol/drug rules.

How to Pass the WI CDL General Knowledge Exam

What You Need to Know

  • Passing score: 80% or more correct answers
  • Assessment: Multiple-choice CDL knowledge test. Wisconsin lists B/C General Knowledge as 50 questions from CDL Manual Sections 1-3; Class A, air brakes, and endorsements require additional tests when applicable.
  • Time limit: WisDOT says CDL knowledge tests take at least 1 to 1.5 hours; no appointment is necessary for knowledge tests.
  • Exam fee: $0 knowledge test; $30 CLP valid 180 days; $74 original Class A/B/C CDL

Keys to Passing

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

WI CDL General Knowledge Study Tips from Top Performers

1Use the Wisconsin Commercial Driver Manual as the primary source; focus first on Sections 1-3 for General Knowledge.
2Memorize Wisconsin logistics: 50 questions for B/C General Knowledge, 80% passing, free knowledge test, CLP valid 180 days, and a 14-day CLP hold before skills testing.
3Separate General Knowledge from endorsements so hazmat, passenger, school bus, tanker, doubles/triples, air brakes, and combination-vehicle details do not blur the core test.
4Practice inspection questions until you can explain why each defect matters for safe operation.
5Give extra attention to Wisconsin-relevant driving conditions such as winter roads, fog, black ice, crosswinds, rural railroad crossings, and long downgrades.
6Review every missed question by category, then return to the matching WisDOT manual section before taking another mixed set.

Frequently Asked Questions

Who administers the Wisconsin CDL General Knowledge test?

Wisconsin DMV administers CDL knowledge tests for Wisconsin CLP and CDL applicants. CDL skills tests are completed with WisDOT-approved third-party examiners.

How many questions are on the Wisconsin CDL General Knowledge test?

WisDOT lists B/C General Knowledge as 50 questions from Wisconsin CDL Manual Sections 1-3. Class A, air brakes, and endorsements require separate tests when applicable.

What score do I need to pass?

WisDOT states that a passing grade is 80% or more correct answers. FMCSA also requires applicants to answer at least 80% correctly on CDL knowledge tests.

How much does Wisconsin CDL knowledge testing cost?

WisDOT lists the CDL knowledge test fee as $0. The Commercial Learner Permit fee is $30, the original Class A/B/C CDL fee is $74, and third-party skills-test fees may apply.

Do I need an appointment for a Wisconsin CDL knowledge test?

WisDOT says all knowledge tests are free and no appointment is necessary. The general Wisconsin knowledge-test page also says in-person knowledge tests are conducted on a walk-in basis.

How long is a Wisconsin CLP valid?

WisDOT states that the Commercial Learner Permit is valid for 180 days. You must hold it at least 14 days before CDL skills testing.

Is this practice test for endorsements?

No. This question bank focuses on Wisconsin CDL General Knowledge. Air brakes, combination vehicles, passenger, school bus, tanker, doubles/triples, and hazardous materials require separate preparation when those tests apply.