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300+ Free Pennsylvania CDL General Knowledge Practice Questions

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

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2026 Statistics

Key Facts: Pennsylvania CDL General Knowledge Exam

80%

Federal Passing Threshold

49 CFR 383.135

30+

Federal Minimum Basic Knowledge Items

FMCSA States / 49 CFR 383.133

20

Required General Knowledge Areas

49 CFR 383.111(a)

1 year

Pennsylvania KTA Validity

PennDOT CDL Learner's Permit FAQ / DL-31CD

3 tries

Knowledge-Test Tries per KTA

PennDOT CDL Learner's Permit FAQ

15 days

Minimum CLP-to-Skills-Test Wait

PennDOT CDL Learner's Permit FAQ

Pennsylvania CDL applicants first submit DL-31CD and DL-11CD, receive a Knowledge Test Authorization, and pass required knowledge tests before a CDL learner permit is issued. PennDOT says the KTA is valid for one year and gives three tries on that KTA; a 15-day wait applies before the scheduled Class A, B, or C skills test after permit issuance. FMCSA standards require at least 30 basic knowledge-test items and at least 80% correct to pass.

Sample Pennsylvania CDL General Knowledge Practice Questions

Try these sample questions to test your Pennsylvania 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 Pennsylvania CDL General Knowledge Exam

The Pennsylvania CDL General Knowledge Test is the basic written knowledge exam for Pennsylvania commercial learner permit and commercial driver license applicants. PennDOT administers CDL knowledge testing through the Knowledge Test Authorization process using the Pennsylvania Commercial Driver's Manual and federal FMCSA standards. FMCSA requires each basic knowledge test to cover the 20 general areas in 49 CFR 383.111(a), contain at least 30 items, and require at least 80% correct to pass. The test emphasizes safe CMV operation: vehicle inspection, basic control, shifting, speed and space management, seeing and communication, adverse conditions, hazards, emergencies, skids, railroad crossings, mountain driving, cargo securement, driver wellness, fatigue, alcohol and drug rules, 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 tests depending on the license sought.

Time Limit

Not published by PennDOT or FMCSA for the General Knowledge test

Passing Score

At least 80% correct on each CDL knowledge test

Exam Fee

$22-$88 CDL upgrade increase fee by remaining license term, $15.50 photo fee when required, and $6 for applicable class, endorsement, or restriction-removal requests (Pennsylvania Department of Transportation Driver and Vehicle Services)

Pennsylvania CDL General Knowledge Exam Content Outline

Core general-knowledge area

Vehicle Inspection

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

Core general-knowledge area

Basic Vehicle Control and Mountain Driving

Starting, accelerating, shifting, steering, backing, turning, off-tracking, speed control, curves, downgrades, and proper braking technique.

Core general-knowledge area

Speed, Space, Seeing, and Communication

Following distance, stopping distance, scanning, mirror use, signaling, railroad crossings, clearance, merging gaps, and hazard perception.

Core general-knowledge area

Adverse Conditions, Emergencies, and Skids

Night visibility, rain, fog, snow, ice, crosswinds, hydroplaning, brake failure, blowouts, fires, crash response, escape ramps, and skid recovery.

Core general-knowledge area

Cargo Securement and Weight

Blocking and bracing, tie-down counts, working load limits, cargo inspection intervals, sealed loads, weight distribution, GVWR/GCWR, and axle/GVW limits.

Core general-knowledge area

FMCSA and Pennsylvania CDL Basics

CDL classes, KTA and CLP steps, DL-31CD/DL-11CD, medical certification, ELDT, drug and alcohol rules, disqualifications, fees, and federal test standards.

How to Pass the Pennsylvania CDL General Knowledge Exam

What You Need to Know

  • Passing score: At least 80% correct on each CDL knowledge test
  • 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 tests depending on the license sought.
  • Time limit: Not published by PennDOT or FMCSA for the General Knowledge test
  • Exam fee: $22-$88 CDL upgrade increase fee by remaining license term, $15.50 photo fee when required, and $6 for applicable class, endorsement, or restriction-removal requests

Keys to Passing

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

Pennsylvania CDL General Knowledge Study Tips from Top Performers

1Use the official Pennsylvania Commercial Driver's Manual as the primary study source; FMCSA says drivers should use their state manual to prepare.
2Master vehicle inspection language: leaks, steering, suspension, tires, brakes, lights, mirrors, coupling systems, cargo problems, and defect reporting.
3Practice speed and space calculations until following distance, stopping distance, curves, downgrades, and clearance decisions are automatic.
4Review railroad crossings, night driving, fog, rain, snow, ice, hydroplaning, blowouts, fires, and skid recovery as scenario questions.
5Know cargo basics: blocking and bracing, tie-downs, load distribution, sealed-load responsibility, and inspection intervals.
6Memorize Pennsylvania process facts: DL-31CD, DL-11CD, KTA purpose, one-year KTA validity, three tries, one-year permit timing, and the 15-day skills-test wait.

Frequently Asked Questions

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

FMCSA requires each basic CDL knowledge test to contain at least 30 items. PennDOT administers Pennsylvania CDL testing through Driver License Centers using the Pennsylvania Commercial Driver's Manual and FMCSA-compliant test standards.

What score do I need to pass the Pennsylvania CDL General Knowledge test?

Federal CDL standards require at least 80% correct on each knowledge test. Pennsylvania must meet that FMCSA passing standard for CDL knowledge testing.

What is a Pennsylvania CDL Knowledge Test Authorization?

A KTA is PennDOT's authorization to appear at a Driver License Center for CDL knowledge testing. It is not a driving permit; the CDL learner permit is issued only after required knowledge tests are passed.

How long is the Pennsylvania CDL KTA valid?

PennDOT states that the KTA is valid for one year from issuance and gives the applicant three tries on that KTA to pass the knowledge tests.

Do I need ELDT before the Pennsylvania General Knowledge test?

ELDT is generally tied to later required steps such as first Class A/B skills testing, Class B-to-A upgrades, and first School Bus, Passenger, or HazMat endorsements when applicable. PennDOT notes entry-level applicants must use a provider listed on the FMCSA Training Provider Registry when ELDT applies.