Free Nebraska CDL practice test online
Take a free Nebraska 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 Nebraska Department of Motor Vehicles.
Nebraska Department of Motor Vehicles 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
Nebraska 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 Nebraska Department of Motor Vehicles is Nebraska’s own, and may be stricter than the federal floor. Test length, fees, and scheduling are set by Nebraska Department 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 RegistryYou need a Nebraska 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 Nebraska non-commercial knowledge test runs 25 questions and needs 20 correct, with permits issued from age 15.
Nebraska 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 Nebraska CDL practice questions
Try these Nebraska 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. A major leak in the emergency (supply) line while driving will typically:
- ARelease only the tractor parking brake
- BDisable headlights
- CHave no effect on trailer brakes
- Cause trailer emergency/spring brakes to apply
Answer: Cause trailer emergency/spring brakes to apply. Sudden trailer braking can be violent—get off the road safely when you can and fix the problem.
Source: Commercial Driver License Manual — Combination vehicles — air lines
2. Trying to downshift after speed has already built on a grade is dangerous because you may:
- AIncrease engine braking automatically
- BDisable spring brakes
- CAlways get a lower gear easily
- Be unable to shift into a lower gear and lose engine braking
Answer: Be unable to shift into a lower gear and lose engine braking. Select the correct low gear before starting down based on weight, grade, weather, and road conditions.
Source: Commercial Driver License Manual — Mountain driving — gear selection
3. On packed snow, reduce speed by:
- AAbout one tenth
- BAbout one third
- A half or more
- DNo reduction if ABS is equipped
Answer: A half or more. Packed snow needs roughly half speed or more of a dry-road speed; icy surfaces require crawling speeds or stopping.
Source: Commercial Driver License Manual — Driving safely — matching speed to the road
4. If an oncoming driver drifts into your lane, the best first move is usually:
- AStraight at them while braking only
- BOnto the centerline
- CTo your left into opposing traffic
- To your right
Answer: To your right. A move right is best because the other driver’s natural response is often to return to their own lane.
Source: Commercial Driver License Manual — Driving emergencies — where to steer
5. Before backing a dolly under the second trailer, confirm trailer height:
- ADoes not matter at all
- Allows the dolly fifth wheel to engage the kingpin properly
- CIs at maximum with landing gear up
- DMatches the tractor paint color
Answer: Allows the dolly fifth wheel to engage the kingpin properly. Adjust landing gear first so you do not damage the trailer nose or miss the lock.
Source: Commercial Driver License Manual — Doubles and triples — coupling sequence
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 Nebraska 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.