Free, full Nebraska CDL general knowledge test practice right here in your browser — real exam format (50 questions, 80% to pass), diagnostic and adaptive modes, spaced-repetition review, and a readiness dashboard. No signup, no paywall — your progress is saved automatically on this device.
CDL safety scenario 8: What is the greatest risk when pulling doubles or triples?
C. Rearward amplification and rollover from quick steering — Rearward amplification and rollover from quick steering. Commercial drivers are expected to manage this situation before it becomes a crash risk. The CDL manual emphasizes controlling the vehicle, inspecting safety-critical systems, and correcting hazards promptly.
During a pre-trip inspection, how do you check that the trailer's rear lights are working without a helper?
B. Use the cab controls to activate each light, then walk to the rear of the trailer to verify they are functioning, or use a reflective surface — Without a helper, activate each light (running, brakes, turn signal) from the cab, then walk to the trailer rear to verify operation. Alternatively, use a reflective surface (dock door, adjacent truck) to see the lights without walking.
When pulling double trailers, which trailer should be placed directly behind the tractor?
C. The heavier trailer — The heavier trailer should always be placed directly behind the tractor. A heavy rear trailer creates a 'crack-the-whip' effect and increases jackknife risk.
Safety chains on a converter dolly must:
D. Be crossed under the connection to prevent the dolly tongue from dropping to the road — Safety chains should be crossed under the connection point. If the pintle hook fails, crossed chains keep the dolly tongue from hitting the road.
CDL safety scenario 33: During an en-route inspection, what should you check after the first 50 miles?
D. Cargo securement, tires, brakes, lights, and coupling devices — Cargo securement, tires, brakes, lights, and coupling devices. Commercial drivers are expected to manage this situation before it becomes a crash risk. The CDL manual emphasizes controlling the vehicle, inspecting safety-critical systems, and correcting hazards promptly.
What is the maximum number of hours a CDL holder may be on duty in any 8-day period under the 70-hour rule?
B. 70 hours — Under the 70-hour/8-day rule (49 CFR 395.3), a driver may not drive after accumulating 70 hours of on-duty time in any 8 consecutive days.
CDL safety scenario 48: If a steer tire fails at highway speed, what should you do first?
C. Grip the wheel firmly and maintain control before braking — Grip the wheel firmly and maintain control before braking. Commercial drivers are expected to manage this situation before it becomes a crash risk. The CDL manual emphasizes controlling the vehicle, inspecting safety-critical systems, and correcting hazards promptly.
If a front tire suddenly blows out at highway speed, you should:
C. Hold the steering wheel firmly, stay off the brake, and let the vehicle slow before easing off the road — A firm grip and gradual slowing keep a front blowout under control; hard braking could pull the vehicle sharply toward the flat tire.
What action should you take if your steering suddenly becomes very difficult (power steering failure)?
B. Reduce speed gradually and keep both hands firmly on the wheel; pull safely off the road and do not drive until repaired — If power steering fails, the vehicle can still be steered but it will require significantly more effort. Reduce speed gradually, keep both hands on the wheel, and safely exit the road. Do not continue driving with a failed power steering system.
If you find a safety defect during an inspection, you should:
D. Have it repaired before driving, since some defects make it illegal to operate the vehicle — Safety defects must be fixed before driving; operating a vehicle with an out-of-service defect is illegal and dangerous.
The Nebraska CDL general knowledge test has 50 questions, and you need 80% to pass — at least 40 correct answers. The practice tests on this page use the same format. The 80% passing score is a federal FMCSA standard used by every state.
80%. You can miss at most 10 of the 50 questions. The readiness dashboard on this page tracks whether you're consistently scoring above that bar.
Yes. Every practice test on this page and everything in the DMVPrep iPhone app is free — no ads, no paywall, no account.
Federal motor carrier safety regulations (FMCSA) — the same rules every state's CDL exam is drawn from. Every question in the DMVPrep app cites the regulation or handbook section it comes from.
Yes — the DMVPrep app includes all 3,745+ questions in Spanish, and the whole app works in Spanish.