Test d'entraînement CDL
Les questions du test restent en anglais.
Voici un échantillon gratuit de 15 questions sur les tests théoriques du CDL, le permis poids lourd des États-Unis, rédigé par l'équipe StudyPDF. Il couvre les connaissances générales, les grands faits sur les freins à air, les bases des ensembles routiers et les règles et démarches sur lesquelles tout candidat est interrogé, en mélangeant questions à choix multiple, questions à réponses multiples et textes à trous. Réponds aux 15 questions, puis regarde ton score et lis l'explication de chaque question. Le manuel CDL de ton État reste le livre dont sortent les vraies questions, alors garde-le à côté de toi.
The CDL skills test is made up of which three parts?
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Les 15 questions en un coup d'œil
Tu préfères lire avant de jouer ? Toutes les questions de l'échantillon sont listées ci-dessous. Les réponses et les explications restent repliées tant que tu ne les ouvres pas.
1. The CDL skills test is made up of which three parts?
- A. A written test, a vision test and a road test
- B. A vehicle inspection test, a written test and a drug test
- C. A vehicle inspection test, a basic vehicle control test and an on-road driving test
- D. A basic control test, a coupling test and an air brake test
Voir la réponse et l'explication
Réponse : C. A vehicle inspection test, a basic vehicle control test and an on-road driving test
The knowledge tests are taken on a computer or on paper, and the skills test is the practical part in the vehicle. It always runs in the same order: you show the examiner your pre-trip inspection, then you demonstrate basic control such as backing and offset alley docking, then you drive on public roads. You have to pass all three, and you take the skills test in a vehicle that matches the class of license you want.
2. You have to stop on the shoulder of a divided highway. Where do the three warning devices go?
- A. All three together, about 50 feet behind the vehicle
- B. One about 10 feet behind the vehicle, one about 100 feet behind and one about 200 feet behind
- C. One 10 feet in front of the vehicle, one 100 feet behind and one 500 feet behind
- D. One at each corner of the vehicle and one on the roof
Voir la réponse et l'explication
Réponse : B. One about 10 feet behind the vehicle, one about 100 feet behind and one about 200 feet behind
On a divided or one way road the devices go behind you, toward the traffic that is coming: about 10 feet back on the traffic side, about 100 feet back and about 200 feet back. On a two lane two way road you protect both directions instead, with a device about 100 feet ahead and about 100 feet behind. You have 10 minutes to get them out, and on a hill or a curve you move the far one back so drivers see it before they see you.
3. You are driving a 50 foot combination at 55 mph on a dry road. Using the rule of thumb in the CDL manual, what is your minimum following distance?
- A. 3 seconds
- B. 4 seconds
- C. 5 seconds
- D. 6 seconds
Voir la réponse et l'explication
Réponse : D. 6 seconds
The rule is one second for every 10 feet of vehicle length at speeds below 40 mph, then add one more second above 40 mph. Fifty feet gives you five seconds, and the extra second for speed makes six. Count the seconds between the vehicle ahead passing a fixed object and your own front bumper reaching it, and add more time on wet or icy roads and at night.
4. You have loaded and secured your cargo and started the trip. When must you first re-check the securement?
- A. There is no need to check again once it is secured
- B. Within the first 50 miles
- C. After the first 150 miles
- D. Only at the end of the driving day
Voir la réponse et l'explication
Réponse : B. Within the first 50 miles
You inspect the cargo and its securement within the first 50 miles, because tiedowns settle and loosen once the load starts moving. After that you re-check every 3 hours or 150 miles, or each time you take a break, whichever comes first. The driver is responsible for the load even when somebody else loaded and secured it, so a sealed trailer you cannot inspect does not remove your duty to stay within weight limits.
5. Which of the following are correct ways to control your speed on a long, steep downgrade?
Coche toutes les bonnes réponses.
- A. Select a low gear before you start down the grade
- B. Shift into neutral and coast to save fuel
- C. Use the braking effect of the engine as your main way of holding speed
- D. Apply the brakes firmly to slow about 5 mph below your safe speed, then release them
- E. Hold light, steady pressure on the brakes all the way down
- F. Wait until you feel the brakes fading before you downshift
Voir la réponse et l'explication
Réponse : A. Select a low gear before you start down the grade, C. Use the braking effect of the engine as your main way of holding speed, D. Apply the brakes firmly to slow about 5 mph below your safe speed, then release them
Gravity is what speeds you up, so the plan has to be set before you start down. Pick the gear at the top, because a heavy vehicle may not go back into gear once it is rolling fast. Let the engine hold most of the speed and use the brakes in firm, short applications, known as snub braking, so they get time to cool between them. Riding the brakes cooks the linings until they stop working, and coasting in neutral is both unsafe and illegal in most states.
6. Complete the sentence.
Under the federal hours of service rules, a property carrying driver may drive for up to _____ hours, and only after _____ consecutive hours off duty.
Options pour le trou 1 : 8, 10, 11, 14
Options pour le trou 2 : 8, 10, 11, 12
Voir la réponse et l'explication
Réponse : 11, 10
Those 11 driving hours have to fit inside a 14 hour window that starts when you come on duty, and the window does not stop for meals or loading. You also need a 30 minute break after 8 cumulative hours of driving, and you are capped at 60 hours in 7 days or 70 hours in 8 days depending on your carrier's schedule. Passenger carrying drivers work to different numbers, and some short haul drivers qualify for an exception, so read the rule that matches your job.
7. You pass your CDL skills test in a vehicle that does not have air brakes. What does that mean for your licence?
- A. Nothing, because the air brakes knowledge test on its own covers you
- B. You may drive air brake vehicles for one year and then have to retest
- C. Your CDL carries an air brake restriction and you may not drive a commercial vehicle with air brakes
- D. You may drive air brake vehicles as long as a licensed driver rides with you
Voir la réponse et l'explication
Réponse : C. Your CDL carries an air brake restriction and you may not drive a commercial vehicle with air brakes
The restriction, usually printed as an L, lands on your licence if you fail the air brakes knowledge test, skip the air brake part of the pre-trip inspection, or take the skills test in a vehicle without air brakes. Most vehicles you will be hired to drive have them, so it closes off a lot of work. Getting it removed means going back and passing the air brake portions in a vehicle that actually has air brakes.
8. Air pressure is falling and the warning has come on. Why should you not pump or fan the brake pedal?
- A. Pumping overheats the brake drums
- B. Pumping locks the trailer wheels before the tractor wheels
- C. Every brake application spends air, so pumping empties the tanks faster
- D. Pumping has no effect at all on an air brake system
Voir la réponse et l'explication
Réponse : C. Every brake application spends air, so pumping empties the tanks faster
This is the habit drivers bring over from cars. In a hydraulic system pumping can build pressure back up, but an air system works the other way, because each press of the pedal releases air from the tanks and you cannot get it back. When air is already low, fanning the pedal spends what little you have left. Use steady pressure, slow down and park.
9. Complete the sentence.
Before you can take the skills test for a first time Class A or Class B licence, federal rules require you to finish _____ with a school listed on the federal Training Provider Registry.
Options pour le trou 1 : entry level driver training, a defensive driving course, a hazmat awareness course, a medical examination
Voir la réponse et l'explication
Réponse : entry level driver training
Entry level driver training has been required since February 2022. It applies to a first time Class A or Class B licence, an upgrade from Class B to Class A, and the first time you go for the passenger, school bus or hazmat endorsement. The training has a theory part and a behind the wheel part, and the provider reports your completion to the registry before your state will schedule the skills test.
10. Two air lines run from the tractor to the trailer. What does the emergency line do?
- A. It carries air only while you are pressing the brake pedal
- B. It vents air out of the trailer tanks when you park
- C. It is a spare line used only if the service line fails
- D. It charges the trailer air tanks and controls the trailer emergency brakes
Voir la réponse et l'explication
Réponse : D. It charges the trailer air tanks and controls the trailer emergency brakes
The emergency line, usually the red one, keeps the trailer supplied with air and holds the emergency brakes off. If it loses pressure, for example because the trailer breaks away or a line rips out, the trailer brakes come on by themselves. The service line, usually the blue one, only carries air when you press the brake pedal or use the trailer hand valve. Cross the two lines and you can drive off with no trailer brakes at all.
11. As you take a right turn in a tractor trailer, the trailer's rear wheels
- A. follow a shorter path than the tractor's front wheels, so you have to swing wide
- B. follow exactly the same path as the tractor's front wheels
- C. follow a wider path than the tractor's front wheels
- D. lift clear of the road until the turn is finished
Voir la réponse et l'explication
Réponse : A. follow a shorter path than the tractor's front wheels, so you have to swing wide
This is off-tracking, and the longer the vehicle the more of it you get. The fix is to turn wide as you complete the turn, not before it: keep the rear of your vehicle close to the curb, drive forward until the front wheels are well past the corner, then turn. Swinging left first invites a car to slip up the right side, and that is exactly where your trailer is about to go.
12. Which of the following lower the risk of rolling a loaded trailer over?
Coche toutes les bonnes réponses.
- A. Keeping the cargo as low as you can
- B. Keeping the load centered over the axles and balanced side to side
- C. Slowing down before you enter a curve or an exit ramp and staying slow through it
- D. Putting the heaviest cargo on top so the weight spreads out
- E. Braking hard in the middle of the curve if the trailer starts to feel light
- F. Taking exit ramps at the posted speed, since ramp speeds are set for trucks
Voir la réponse et l'explication
Réponse : A. Keeping the cargo as low as you can, B. Keeping the load centered over the axles and balanced side to side, C. Slowing down before you enter a curve or an exit ramp and staying slow through it
Rollovers account for a large share of the crashes that kill truck drivers, and most of them come down to two things: a load carried too high and too much speed in a curve. A high center of gravity tips long before the driver feels anything wrong, and the trailer can go over while the tractor still feels planted. Posted ramp speeds are set for cars, so a loaded rig often has to be well under them.
13. You want to drive a single vehicle with a gross vehicle weight rating of 26,001 pounds or more, and you will not tow anything heavier than 10,000 pounds. Which class of CDL covers that?
- A. Class A
- B. Class B
- C. Class C
- D. No CDL is required
Voir la réponse et l'explication
Réponse : B. Class B
Class B is the single heavy vehicle license, such as a straight truck, a dump truck or a large bus, and it lets you tow a trailer up to 10,000 pounds. Class A covers combinations with a gross combination weight rating of 26,001 pounds or more where the towed unit is over 10,000 pounds. Class C covers smaller vehicles that fall outside A and B but carry 16 or more people including the driver, or carry hazardous materials in amounts that need placards. The higher class also lets you drive the lower ones, as long as you hold the right endorsements.
14. Which of these require a separate endorsement on your CDL?
Coche toutes les bonnes réponses.
- A. Hauling hazardous materials in amounts that require placards
- B. Driving a school bus
- C. Driving after dark
- D. Driving a tank vehicle
- E. Driving across a state line
- F. Towing a trailer under 10,000 pounds
Voir la réponse et l'explication
Réponse : A. Hauling hazardous materials in amounts that require placards, B. Driving a school bus, D. Driving a tank vehicle
An endorsement is permission added to your license for a specific kind of load or vehicle, and each one has its own knowledge test. The common ones are H for hazardous materials, N for tank vehicles, P for passengers, S for school bus, T for doubles and triples, and X for a tank carrying hazardous materials. The hazardous materials endorsement also needs a security threat assessment, so it takes longer to get. Restrictions work the other way and take something away, for example an L restriction if you never passed the air brake test.
15. Complete the sentence.
A driver of a commercial motor vehicle is considered to be under the influence at a blood alcohol concentration of _____ or higher, and may not drink alcohol within _____ hours of going on duty.
Options pour le trou 1 : 0.02, 0.04, 0.08, 0.10
Options pour le trou 2 : 2, 4, 8, 12
Voir la réponse et l'explication
Réponse : 0.04, 4
The commercial limit is half the usual limit for car drivers, and a reading between 0.02 and 0.039 still puts you out of service for 24 hours even though it is under the legal limit. Refusing a required test counts the same as failing it. A first major offense such as this one disqualifies you for at least a year, three years if you were hauling placarded hazardous materials, and a second major offense is a lifetime disqualification.
Ce que couvre vraiment le test théorique du CDL
Il n'existe pas d'examen CDL national unique. C'est ton État américain qui fait passer le test, et presque tous les États le rédigent à partir du Commercial Driver License Manual modèle de l'AAMVA, qu'ils republient gratuitement sous forme de manuel CDL local. La chose la plus utile qu'un test d'entraînement CDL puisse faire, c'est donc de te renvoyer vers ce livre, parce que tes vraies questions en sortent. Commence par télécharger le manuel à jour de ton État.
Les tests que tu passes dépendent de ce que tu veux conduire. Tout le monde passe les connaissances générales. Tu ajoutes les freins à air si ton véhicule en a, les ensembles routiers pour une Class A, et un test séparé pour chaque endorsement, la mention qui s'ajoute au permis, par exemple tank (citerne), passenger (transport de personnes), school bus (autobus scolaire) ou hazardous materials (matières dangereuses). Le nombre de questions et le score de réussite sont fixés par ton État, et quatre-vingts pour cent est un seuil courant, alors va lire la page de l'organisme de permis de ton État plutôt qu'un chiffre trouvé en ligne.
Il y a aussi des démarches autour du test. Il te faut un commercial learner's permit, le permis d'apprenti conducteur professionnel, avant de pouvoir t'entraîner sur la route, et la plupart des États t'obligent à le détenir pendant un délai d'attente. Les conducteurs qui circulent entre États doivent avoir au dossier un medical examiner's certificate en cours de validité, le certificat médical fédéral. Les nouveaux candidats Class A et Class B, ainsi que les candidats aux endorsements hazardous materials, passenger et school bus, doivent en plus suivre la formation initiale ELDT auprès d'un organisme inscrit au Training Provider Registry fédéral.
Comment utiliser cet échantillon
Cette série balaie l'ensemble du test théorique au lieu de creuser une seule partie. Six questions portent sur les connaissances générales, trois sur les grands faits des freins à air, trois sur les bases des ensembles routiers, et trois sur les règles et les démarches qui reviennent quelle que soit la classe que tu vises. C'est une carte, pas une formation complète, alors sers-t'en pour repérer le chapitre de ton manuel où tu es le plus faible.
Fais-le d'une traite, sans notes, puis lis l'explication de chaque question, y compris celles que tu as réussies. Traite une erreur comme un thème et non comme un fait isolé. Si tu as raté la question sur l'alerte de basse pression d'air, n'apprends pas seulement le chiffre par cœur, va lire tout le chapitre sur les freins à air, parce que le test pose la même idée sous plusieurs angles.
Les trois quiz liés plus bas creusent les connaissances générales, les freins à air et les ensembles routiers. Commence par celui-ci pour voir où tu en es, puis fais celui qui correspond au test que tu as vraiment programmé. Lire ton manuel à voix haute, une section à la fois, puis répondre à des questions sur cette section, c'est plus lent que de survoler et ça marche bien mieux.
Comment StudyPDF transforme le manuel CDL de ton État en tests complets
Quinze questions peuvent te montrer où tu es fragile. Elles ne suffisent pas à te rendre prêt, et aucune banque générique ne colle au manuel de ton État, qui est le livre exact dont ton examinateur tire ses questions.
StudyPDF part plutôt de ton matériel. Tu importes le PDF du manuel CDL de ton État, les polycopiés de ton école de conduite ou les chapitres d'endorsement qui t'intéressent, et Bo, l'agent de révision, crée des tests d'entraînement complets à partir de ces pages exactes. Chaque question est ancrée dans ton document, et chaque explication indique d'où vient la réponse, tu peux donc sauter directement à la page quand quelque chose te semble faux. Tu peux générer de nouveaux tests aussi souvent que tu veux, les restreindre à une seule section comme les freins à air ou l'arrimage du chargement, et suivre les thèmes que tu rates sans arrêt.
Tu n'as pas besoin de fichier pour commencer. Si tu n'as encore rien à importer, nomme simplement un thème, par exemple l'attelage d'un ensemble routier ou les hours of service, les règles fédérales de temps de conduite, et Bo écrit un test d'entraînement dessus. Commencer est gratuit.
Rédigé par l'équipe StudyPDF. Mis à jour le 2026-08-19.