Free, full North Dakota 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. Matched to the official NDDOT knowledge exam.
The minimum tread depth required for the front (steering) tires of a commercial vehicle is:
A. 4/32 inch — Steering tires must have at least 4/32 inch of tread, while other tires need at least 2/32 inch, to maintain grip and control.
CDL safety scenario 55: When driving a bus, when should riders be counted?
B. After each stop where passengers board or leave — After each stop where passengers board or leave. 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 a 'walk-around inspection' and when is it required?
B. A systematic exterior inspection of the entire vehicle performed before each trip, checking all major components — A walk-around pre-trip inspection is a systematic exterior examination of the vehicle before each trip. It is required by 49 CFR 392.7 and must be completed before driving to ensure the vehicle is safe to operate.
CDL safety scenario 87: If the low air pressure warning activates while driving a commercial vehicle, what should you do?
B. Stop safely as soon as possible — Stop safely as soon as possible. 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.
The shaded areas around this tractor-trailer represent the 'No-Zones.' As another driver, you should:
B. Avoid lingering in these blind spots where the trucker cannot see you — The No-Zones are large blind spots where the truck driver cannot see you, so avoid lingering there and pass on the left 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.
Regular, brief glances at your mirrors while driving help you:
D. Track traffic around you and spot problems with your tires or cargo — Frequent mirror checks let you monitor surrounding traffic and catch tire, cargo, or trailer problems before they become emergencies.
CDL safety scenario 75: If the low air pressure warning activates while driving a commercial vehicle, what should you do?
B. Stop safely as soon as possible — Stop safely as soon as possible. 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 minimum air pressure required before driving a CMV with air brakes?
C. 100 psi — Before driving, air pressure should be at least 100 psi (some sources say 90 psi minimum before releasing the parking brakes). Normal operating range is typically 100–125 psi.
When checking belts in the engine compartment, a belt with more than about 3/4 inch of play:
B. Is too loose and should be reported and adjusted — A belt that deflects more than about 3/4 inch is too loose and may slip, so it should be tightened or replaced before driving.
The North Dakota 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.
In North Dakota, driver licensing is handled by the North Dakota Department of Transportation (NDDOT), so you'll often see the exam called the NDDOT CDL general knowledge test. The practice tests on this page match the official NDDOT knowledge exam format.
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.