Free Kentucky CDL practice test online
Take a free Kentucky 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 Kentucky Driver Licensing.
Kentucky Driver Licensing gives the general knowledge test as 50 questions, and federal law sets the bar at 80% correct on every knowledge test. You must also hold a commercial learner’s permit for 14 days before the skills test.
New to the knowledge test? CDL endorsements explained · One-week study plan
Requirements before you test
Kentucky CDL test requirements
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 Kentucky Driver Licensing is Kentucky’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by Kentucky Driver Licensing (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 RegistryYou need a Kentucky 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 Kentucky non-commercial knowledge test runs 40 questions and needs 32 correct, with permits issued from age 15.
Kentucky permit practice testWhat you will practice
Build coverage topic by topic.
Each question carries a topic, difficulty, explanation, and source section so your review has context.
Sample questions
5 Kentucky CDL practice questions
Try these Kentucky 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. Covering cargo is done mainly to:
- AIncrease axle weight ratings
- BHide the load from competitors
- Protect people from spilled cargo and protect the cargo from weather
- DReduce tire wear
Answer: Protect people from spilled cargo and protect the cargo from weather. Spill protection is often required by state law, and covers also shield freight from weather damage.
Source: Commercial Driver License Manual — Transporting cargo — covering cargo
2. Converter dollies built on or after March 1, 1998, are required to have:
- ANo brakes
- Antilock brakes (with a yellow lamp on the left side)
- COnly hydraulic brakes
- DA sleeper berth
Answer: Antilock brakes (with a yellow lamp on the left side). Look for the yellow ABS lamp on the left side of the dolly.
Source: Commercial Driver License Manual — Doubles and triples — ABS on dollies
3. Repeatedly pressing and releasing the brake pedal without need can:
- Let air out faster than the compressor can replace it so brakes may not work
- BCool the drums permanently
- CDisable only ABS
- DCharge the tanks faster
Answer: Let air out faster than the compressor can replace it so brakes may not work. Each application uses stored air. Unnecessary fanning risks low pressure and loss of braking.
Source: Commercial Driver License Manual — Air brakes — brake pedal
4. Cargo securement on trucks/truck tractors must be rechecked within the first:
- A10 miles
- 50 miles, then every 150 miles or 3 hours (whichever comes first)
- C500 miles only
- DOnly at the destination
Answer: 50 miles, then every 150 miles or 3 hours (whichever comes first). The first check catches settling after departure; later checks catch vibration loosening.
Source: Commercial Driver License Manual — Inspecting cargo — en-route
5. Placards, labels, and shipping papers exist primarily to:
- AReplace driver training
- BSet fuel tax rates
- CAdvertise the carrier brand
- Communicate the hazard so workers and responders know the risk
Answer: Communicate the hazard so workers and responders know the risk. After a crash you may be unable to speak—clear hazard communication saves lives.
Source: Commercial Driver License Manual — Hazardous materials — intent
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 Kentucky just like everywhere else — the endorsement guide explains how the codes fit together.
The foundation for commercial driving: inspections, space, speed, communication, hazards, and safe operation.
- Pre-trip inspection
- Space and speed management
- Railroad crossings
- Emergency procedures
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
Prepare for safe coupling, inspection, turning, backing, and handling of tractor-trailer combinations.
- Fifth-wheel inspection
- Coupling and uncoupling
- Off-tracking
- Trailer skid prevention
Study hazard communication, shipping papers, placards, loading rules, parking, and emergency response responsibilities.
- Hazard classes
- Placards and labels
- Shipping papers
- Loading and segregation
Learn how liquid surge, outage, bulkheads, and high centers of gravity change vehicle handling.
- Liquid surge
- Outage requirements
- Smooth braking
- Rollover prevention
Practice converter-dolly inspection, coupling order, rearward amplification, and stability principles.
- Coupling sequence
- Converter dollies
- Rearward amplification
- Space management
Prepare to inspect, load, and operate buses while keeping passengers, aisles, and exits safe.
- Vehicle inspection
- Passenger loading
- Emergency exits
- Prohibited practices
Review student loading, danger zones, mirrors, emergency procedures, and special railroad-crossing duties.
- Danger zones
- Student loading
- Mirror use
- Railroad crossings
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Common questions
What this practice can—and cannot—tell you.