Free, full Hawaii 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.
The converter dolly connects:
A. The first trailer to the second trailer — The converter dolly couples the rear of the first trailer to the front of the second trailer in a doubles combination.
Property-carrying drivers must take a 30-minute break after how many hours of driving time?
C. 8 hours — A 30-minute break is required after 8 cumulative hours of driving time, satisfied by any non-driving period of at least 30 minutes.
What is a 'converter dolly' used for?
B. To connect a second semitrailer to a lead trailer, forming a double combination — A converter dolly is a set of one or two axles with a fifth wheel, used to convert a semitrailer into a full trailer. It connects two trailers to make a double (B-train) combination.
CDL safety scenario 61: Why must cargo weight be balanced side to side?
D. Uneven weight can make the vehicle lean or roll over more easily — Uneven weight can make the vehicle lean or roll over more easily. 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 should you do before loading a tanker with food-grade product?
B. Verify the tank is clean and that the previous cargo was compatible or the tank is sanitized — Before loading food-grade liquids, the driver must verify the tank is properly cleaned and that the previous cargo was compatible to prevent contamination.
GVWR (Gross Vehicle Weight Rating) is:
B. The maximum total weight of a single vehicle plus its load, set by the manufacturer — GVWR is the manufacturer's maximum safe loaded weight for a single vehicle; exceeding it strains the brakes, tires, and frame.
Off-tracking causes the trailer to:
C. Follow a different path than the tractor when turning — Off-tracking means the rear wheels of a trailer follow a shorter path than the front wheels when turning. The longer the vehicle, the more off-tracking.
What does GVWR stand for?
D. Gross Vehicle Weight Rating — GVWR (Gross Vehicle Weight Rating) is the maximum weight a vehicle is rated to carry, including its own weight plus cargo and all passengers. It is set by the manufacturer.
How far from a railroad crossing must you stop a bus carrying passengers?
B. 15 to 50 feet — A bus carrying passengers must stop between 15 and 50 feet from the nearest rail at a railroad crossing. Stop, look, listen, and only proceed when the crossing is clear and safe.
When checking manual slack adjusters with the brakes released, the pushrod should move:
D. About one inch or less when pulled hard by hand — If a pushrod moves more than about an inch when pulled by hand, the brakes are out of adjustment and must be serviced.
The Hawaii 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.