Free, full Connecticut 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.
A tanker endorsement is required when the tank capacity is:
D. 1,000 gallons or more — A tanker endorsement (N) is required for vehicles with permanently attached tanks rated at 1,000 gallons or more capacity.
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.
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.
Which of the following is a disqualifying offense that results in permanent CDL disqualification upon a second conviction?
B. Using a CMV in the commission of a felony involving controlled substances — Using a CMV to commit a felony involving manufacturing, distributing, or dispensing controlled substances results in lifetime CDL disqualification on the first offense.
When transporting hazmat and parking temporarily, the vehicle must:
B. Be attended or parked in a safe, legal location — A loaded hazmat vehicle must be attended or parked in a designated safe area. Specific parking rules vary by class of material.
Baffles inside a liquid tank are used to:
B. Reduce forward-and-back liquid surge — Baffles have holes that slow the liquid's forward-and-back movement, reducing surge, though they do little for side-to-side motion.
What is 'black ice'?
B. A thin, nearly transparent layer of ice that makes the road appear wet or normal but is extremely slippery — Black ice is a thin, nearly transparent layer of ice that takes on the appearance of the pavement beneath it. It is extremely slippery and difficult to see, making it especially hazardous.
When you must drive in fog, you should:
B. Slow down, use low beams, and turn on fog lights if you have them — Low beams cut glare off the fog and slowing down gives you time to react, while high beams reflect back and reduce visibility.
When testing air leakage rate, the maximum allowable loss with engine off and service brakes applied is:
D. 3 PSI per minute — With a fully charged system and service brakes applied, air loss should be no more than 3 PSI per minute (single vehicle) or 4 PSI (combination).
When approaching to couple to a trailer, you should stop with the fifth wheel gap:
B. Just under the trailer nose — slightly in front of the kingpin landing zone — Back under the trailer until the fifth wheel just contacts the nose of the trailer. The fifth wheel should be aligned so the kingpin will engage properly when the tractor backs completely under.
The Connecticut 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.