Simulado CDL General Knowledge

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Todas as 15 questões de uma vez

Prefere ler antes de jogar? Todas as questões da amostra estão listadas abaixo. As respostas e as explicações ficam fechadas até você abrir.

1. 1. Federal rules require a commercial vehicle to carry a set of emergency equipment. Which set is correct?

   • A. A first aid kit, a tire pressure gauge and a flashlight
   • B. Two red flags, jumper cables and a spare fuel filter
   • C. Three red reflective warning triangles, at least one charged and rated fire extinguisher, and spare electrical fuses if the vehicle uses them
   • D. A wheel chock, a reflective vest and a spare drive belt
   Mostrar resposta e explicação

   Resposta: C. Three red reflective warning triangles, at least one charged and rated fire extinguisher, and spare electrical fuses if the vehicle uses them

   You check this equipment during the in-cab step of the seven step inspection, before you check the lights and start the walkaround. Warning devices mark your vehicle for other drivers when you have to stop on the shoulder, the extinguisher has to be charged and rated for what you haul, and fuses only apply if the vehicle uses them, since many use circuit breakers instead. A first aid kit and a flashlight are smart to carry, but they are not what the rule asks for.

2. 2. You are on the walkaround part of your pre-trip inspection. Which findings mean the vehicle should not go out until it is repaired?

   Marque todas as opções corretas.

   • A. A steering axle tire measuring 3/32 inch of tread
   • B. A recapped tire on a drive axle
   • C. A cut in a tire deep enough to show the body ply underneath
   • D. A rear tire measuring 5/32 inch of tread
   • E. A crack running across the rim of a wheel
   Mostrar resposta e explicação

   Resposta: A. A steering axle tire measuring 3/32 inch of tread, C. A cut in a tire deep enough to show the body ply underneath, E. A crack running across the rim of a wheel

   Front tires carry the steering and the most load per tire, so they need more tread than the rest, and 3/32 inch is under the minimum. Any tire with fabric, body ply or belt material showing is unsafe no matter how much tread is left, and a cracked or bent rim can let a tire come off the wheel. A recapped tire is legal on a drive axle, and 5/32 inch on a rear tire is above the minimum, so neither of those grounds the vehicle.

3. 3. Complete the sentence.

   Federal rules set a minimum tread depth of _____ inch on the tires of the steering axle and _____ inch on every other tire.

   Opções para a lacuna 1: 2/32, 4/32, 6/32, 8/32

   Opções para a lacuna 2: 1/32, 2/32, 4/32

   Mostrar resposta e explicação

   Resposta: 4/32, 2/32

   Measure in a major groove, not on a rib or a wear bar, and check more than one spot, since uneven wear can leave one shoulder legal and the other bald. Tread depth is one of the few numbers the general knowledge test asks you for directly. Uneven wear is also a clue to something else, so a front tire wearing on one edge usually means an alignment or inflation problem rather than a tire problem.

4. 4. You have to back into a space and you can choose which side to back toward. What is the safer choice and why?

   • A. Back toward the driver side, because you can see that side of the vehicle directly as well as in the mirror
   • B. Back toward the passenger side, because that mirror is convex and shows a wider view
   • C. Either side is equally safe as long as you use both mirrors
   • D. Back toward the passenger side, because oncoming traffic sees you sooner
   Mostrar resposta e explicação

   Resposta: A. Back toward the driver side, because you can see that side of the vehicle directly as well as in the mirror

   Backing toward the passenger side is blind side backing, and it forces you to trust one mirror for a whole quarter of the vehicle. A wider mirror view does not make up for losing the direct look. Whichever side you use, get out and walk the area first, back slowly, and if you have a helper, agree on hand signals in advance and keep the helper somewhere you can see in the mirror, with a clear signal that means stop.

5. 5. You are making a tight right turn at an intersection in a long vehicle. What is the correct technique?

   • A. Swing wide to the left first so the rear has room, then complete the turn
   • B. Move to the center of the road before the turn so nobody can come up on your right
   • C. Turn from the left lane whenever the corner looks tight
   • D. Keep the rear of the vehicle close to the curb and swing wide only as you complete the turn
   Mostrar resposta e explicação

   Resposta: D. Keep the rear of the vehicle close to the curb and swing wide only as you complete the turn

   The rear wheels follow a tighter path than the front wheels, which is called off tracking, so a long vehicle has to turn wide somewhere. Doing it at the end keeps the gap on your right closed. If you swing left first, a driver behind you may read it as a left turn or slip into the space on your right and get squeezed against the curb. If you cannot make the turn without crossing into the oncoming lane, wait until that lane is clear rather than starting the turn and hoping.

6. 6. Complete the sentence.

   Below 40 mph, allow one second of following distance for every _____ feet of vehicle length. At 55 mph, a 60 foot combination should therefore keep at least _____ seconds of space ahead.

   Opções para a lacuna 1: 5, 10, 15, 20

   Opções para a lacuna 2: 4, 5, 6, 7

   Mostrar resposta e explicação

   Resposta: 10, 7

   Sixty feet divided by ten gives six seconds, and above 40 mph you add one more second, which makes seven. To count it, watch the vehicle ahead pass a fixed object such as a sign or an overpass shadow, then count the seconds until the front of your vehicle reaches the same point. Add more space on wet or icy roads, at night, and any time you are following something you cannot see past.

7. 7. Total stopping distance is the sum of which three distances?

   • A. Perception distance, braking distance and skid distance
   • B. Perception distance, reaction distance and braking distance
   • C. Reaction distance, braking distance and following distance
   • D. Sight distance, reaction distance and braking distance
   Mostrar resposta e explicação

   Resposta: B. Perception distance, reaction distance and braking distance

   Perception distance is how far you travel from the moment your eyes see a hazard until your brain recognizes it. Reaction distance is how far you travel from that recognition until your foot reaches the brake. Braking distance is how far the vehicle travels once the brakes are actually working. The model manual puts all three together at 55 mph on dry pavement with good brakes at roughly 335 feet, which is longer than a football field, and that is why looking far ahead buys you more than any braking technique.

8. 8. Which statements about speed and stopping are true?

   Marque todas as opções corretas.

   • A. Braking distance grows in step with speed, so twice the speed means twice the distance
   • B. Doubling your speed roughly quadruples the braking distance
   • C. An empty truck can need a longer stopping distance than a loaded one
   • D. Wet pavement makes no difference as long as the tires have legal tread
   • E. Posted curve speeds are set with cars in mind, so a heavy vehicle often has to go slower than the sign
   Mostrar resposta e explicação

   Resposta: B. Doubling your speed roughly quadruples the braking distance, C. An empty truck can need a longer stopping distance than a loaded one, E. Posted curve speeds are set with cars in mind, so a heavy vehicle often has to go slower than the sign

   Braking distance grows with the square of speed, so the jump from 20 to 40 mph costs you about four times the distance, not two. An empty truck feels nimble but has less weight pressing its tires down, and its brakes and suspension are built for a load, so it can skid and stop poorly. On wet roads the usual guidance is to cut your speed by about a third, on packed snow by about half, and on ice to slow to a crawl and get off the road as soon as you safely can.

9. 9. How far ahead should you be looking while you drive?

   • A. About 2 to 4 seconds ahead, since that is where a hazard would actually reach you
   • B. Only as far as your headlights reach, so you do not miss what is close
   • C. About 12 to 15 seconds ahead, which is roughly a quarter mile at highway speed
   • D. About 30 seconds ahead, which is roughly a mile at highway speed
   Mostrar resposta e explicação

   Resposta: C. About 12 to 15 seconds ahead, which is roughly a quarter mile at highway speed

   Twelve to fifteen seconds is about one city block in town and about a quarter mile on the highway. At that range you still have time to slow smoothly or change lanes instead of braking hard. Looking far ahead does not mean staring at one point, so keep scanning near and far and check your mirrors every five to eight seconds, more often when traffic is heavy or you are near other vehicles.

10. 10. Why should you shift into a low gear before you start down a long, steep grade?

    • A. Because engine braking then helps hold your speed, and the transmission may not let you get into a low gear once you are already rolling fast
    • B. Because a low gear increases air flow through the radiator and stops the engine overheating
    • C. Because the higher the gear, the harder the service brakes hold
    • D. Because a low gear locks the drive axles together and gives you extra traction
    Mostrar resposta e explicação

    Resposta: A. Because engine braking then helps hold your speed, and the transmission may not let you get into a low gear once you are already rolling fast

    Gravity keeps adding speed the whole way down, so the gear does the steady work and the brakes are there to supplement it, not to carry the descent alone. Brakes that are held on continuously heat up and fade, and by the time you notice that they are fading you have very little left. Your safe speed depends on the weight, the length and steepness of the grade, the road surface and the weather, so read the signs at the top and know where the escape ramps are before you need one.

11. 11. Complete the sentence.

    Cargo held down with tiedowns needs at least one tiedown for every _____ feet of cargo, and no load, however short, may have fewer than _____ tiedowns.

    Opções para a lacuna 1: 5, 8, 10, 12

    Opções para a lacuna 2: one, two, three

    Mostrar resposta e explicação

    Resposta: 10, two

    The count is only half of it, since the combined working load limit of the tiedowns has to be at least half the weight of the cargo they hold. Securement is also the driver's job even when someone else loaded the trailer, so inspect the load before you leave, again within the first 50 miles, and then every 150 miles or every 3 hours, whichever comes first. Weight that sits too high raises the center of gravity and makes a rollover in a curve or an exit ramp much easier.

12. 12. A fire starts in the wiring behind your dashboard. Which extinguisher is right, and what must you not do?

    • A. A class A extinguisher, and do not aim at the base of the flames
    • B. Water, and do not open the hood
    • C. A class D extinguisher, and do not shut the engine off
    • D. A B:C or A:B:C extinguisher, and do not put water on an electrical fire
    Mostrar resposta e explicação

    Resposta: D. A B:C or A:B:C extinguisher, and do not put water on an electrical fire

    Class A covers ordinary combustibles like wood, paper and cloth, class B covers burning liquids such as fuel and grease, class C covers electrical fires and class D covers burning metals. Water conducts electricity and it spreads a liquid fire instead of putting it out, so the B:C rating is what matters here. Before you use it, pull well off the road away from buildings and other vehicles, shut the engine off, call for help, then stay upwind, aim at the base of the flames and use short bursts. Only fight a fire that is small enough for you to handle.

13. 13. You are approaching a railroad crossing with no gate and a clear view of the track. What should you do?

    • A. Shift down as you reach the rails so you can accelerate away quickly
    • B. Stay in one gear the whole way across, and do not start across unless you can clear the far side without stopping
    • C. Stop on the near rail, look both ways, then move on
    • D. Speed up so you spend less time on the tracks
    Mostrar resposta e explicação

    Resposta: B. Stay in one gear the whole way across, and do not start across unless you can clear the far side without stopping

    Changing gears on the crossing is how drivers end up stalled on the rails, so pick your gear before the tracks and hold it. A tractor and trailer needs roughly 14 to 15 seconds to clear a single track, longer for a double track, so you have to see room for the whole vehicle on the far side before you start. Watch for raised or humped crossings if you drive anything low slung, and remember that buses and some placarded loads have to stop at every crossing whether or not a train is coming.

14. 14. Which statements about skids are true?

    Marque todas as opções corretas.

    • A. Most skids happen because the vehicle was going too fast for the conditions
    • B. Black ice is easy to spot because it turns the pavement white
    • C. Pressing harder on the accelerator is the quickest way to straighten out a skid
    • D. In a drive wheel skid caused by braking too hard, you stop braking, let the wheels roll again, then countersteer
    • E. In a front wheel skid the vehicle keeps going straight no matter which way you turn the steering wheel
    Mostrar resposta e explicação

    Resposta: A. Most skids happen because the vehicle was going too fast for the conditions, D. In a drive wheel skid caused by braking too hard, you stop braking, let the wheels roll again, then countersteer, E. In a front wheel skid the vehicle keeps going straight no matter which way you turn the steering wheel

    Skids are mostly a speed problem, whether that is braking too hard, turning too fast or accelerating too hard on a slick surface. A drive wheel skid ends when the wheels start rolling again, so you release the brake or ease off the accelerator first, then steer back the other way as the rear comes into line. A front wheel skid is different, because the steering tires have already lost their grip, so the only cure is to let the vehicle slow until they bite again. Black ice is a thin clear layer and the road just looks wet, so watch your mirror arms and antenna for ice as a warning.

15. 15. Which statement about alcohol and a CDL is correct?

    • A. A CDL holder is held to the same blood alcohol limit as any other driver in the state
    • B. Coffee, fresh air or a cold shower will bring a blood alcohol level down faster
    • C. Alcohol only affects a driver once the legal limit has been passed
    • D. Driving a commercial vehicle with a blood alcohol concentration of 0.04 or higher is a violation, and any detectable alcohol puts the driver out of service
    Mostrar resposta e explicação

    Resposta: D. Driving a commercial vehicle with a blood alcohol concentration of 0.04 or higher is a violation, and any detectable alcohol puts the driver out of service

    The commercial limit of 0.04 is half the 0.08 that applies to ordinary drivers in most states, and detectable alcohol below 0.04 still gets you placed out of service for 24 hours. Drivers are also barred from drinking within four hours of going on duty. Judgment, reaction time and vision all get worse well before any legal limit is reached, and only time removes alcohol from the body, so nothing you drink or do speeds it up.

O que a prova de general knowledge do CDL cobra de verdade

Todo candidato à commercial driver license faz a prova de general knowledge, seja qual for a classe de veículo que pretenda dirigir. É uma prova escrita aplicada pelo seu estado nos Estados Unidos, montada a partir do manual de CDL do próprio estado, que você baixa de graça no órgão estadual de habilitação. A maioria dos manuais estaduais é uma versão levemente editada do manual modelo da AAMVA, então o conteúdo é quase o mesmo em todo lugar. O número de questões e a nota de aprovação são definidos pelo estado, não por um órgão nacional. Oitenta por cento é a nota de corte mais comum, mas o único número em que vale confiar é o que está impresso no manual do seu estado ou no site de habilitação dele. Você precisa passar nesta prova antes de qualquer prova de endorsement e antes de poder agendar o skills test, a prova prática.

O conteúdo vem de alguns capítulos desse manual. Dirigir com segurança é o maior deles: inspeção do veículo, controle básico, trocas de marcha, enxergar e se comunicar, gestão de espaço e de velocidade, identificar riscos, manobras de emergência, controle e recuperação de derrapagem, direção noturna, no inverno, no calor e na montanha, passagens de nível, procedimentos em acidente e incêndios. Transportar carga com segurança acrescenta peso, equilíbrio e amarração. Depois vêm aptidão do motorista, as regras sobre álcool e drogas, e os limites básicos de hours of service para quem transporta carga, hoje 11 horas de direção depois de 10 horas consecutivas de descanso, dentro de uma janela de 14 horas. As regras federais de jornada são revisadas de tempos em tempos, então confirme na norma atual da FMCSA em vez de em uma apostila velha.

O que varia de estado para estado é tudo o que está em volta do conteúdo: a taxa, quantas tentativas você tem, quanto tempo espera entre elas, se a prova é em papel ou em tela sensível ao toque, e se há um leitor disponível. Air brakes, combination vehicles, tanques, doubles and triples, passenger, school bus e hazardous materials são todas provas separadas, com questões próprias, então general knowledge é a primeira prova escrita e não a prova escrita inteira. As regras federais de entry level driver training também valem desde 2022 e mudam quando você pode fazer o skills test e a prova teórica de hazmat. Confira a página do seu estado para saber a ordem atual dos passos.

Como usar esta amostra

Estas 15 questões ficam dentro do conteúdo de general knowledge e vão mais fundo do que uma amostra mista de CDL. Elas perguntam por que uma regra existe, não só o que ela diz: por que dar ré para o lado do motorista, por que um caminhão vazio pode ser mais difícil de parar do que um carregado, por que a marcha reduzida entra antes da descida e não no meio dela. É esse raciocínio que segura os números na sua cabeça no dia da prova, e é ele que a estrada vai te cobrar depois. Questões de freios a ar, de engate e de placards ficaram de fora de propósito, porque pertencem às provas e às páginas delas, linkadas abaixo. Se você estuda para mais de uma prova escrita, faça essas amostras em sessões separadas em vez de misturar tudo.

Faça tudo de uma vez com o manual fechado, e depois leia a explicação de cada questão, inclusive das que você acertou. Trate uma resposta errada como um capítulo para reler, não como um fato solto para decorar. Se você errou a questão de distância de seguimento e a de distância de parada, o tema a rever é gestão de espaço como um todo, não aqueles dois números. Uma lista curta de números vale mesmo a pena saber de cor, porque a prova cobra eles direto: as duas profundidades mínimas de sulco do pneu, a regra de um segundo a cada 10 pés de comprimento para a distância de seguimento, as três partes da distância de parada, uma amarra a cada 10 pés de carga com mínimo de duas, e o nível de álcool de 0,04. O resto quase todo dá para deduzir.

Depois leia o manual em si. Ele é grátis, dá para vencer em algumas noites, e as questões de verdade saem dele. Quando um número que você leu em outro lugar não bate com o manual do seu estado, o manual ganha, porque foi o seu estado que escreveu a prova. Esta amostra também não cobre tudo o que pode cair. Direção noturna, checagens em dias quentes, direção na montanha, direção distraída e agressiva, onde colocar os dispositivos de sinalização depois de parar no acostamento e o que fazer no local de um acidente estão todos na prova e nenhum deles aparece nestas 15 questões. Um jeito rápido de achar essas lacunas é passar o olho nos títulos dos capítulos e marcar todo aquele que você não conseguiria resumir em uma frase.

Como a StudyPDF cria simulados completos do seu próprio material

Quinze questões mostram onde você está inseguro. Elas não deixam você pronto sozinhas, e um banco de questões genérico não faz ideia de qual manual estadual você está estudando nem do que a sua escola de formação enfatiza mais.

A StudyPDF segue outro caminho. Você envia o manual de CDL do seu estado, as apostilas da sua escola de formação ou as anotações que fez em aula, e o Bo, o agente de estudo, cria simulados completos a partir exatamente dessas páginas. Cada questão é baseada no seu material, e cada explicação aponta de onde vem a resposta, então dá para ir direto à página quando algo parecer estranho. Você pode gerar simulados novos quantas vezes quiser, restringir a uma área só, como amarração de carga ou gestão de espaço, e acompanhar quais temas você continua errando.

Você não precisa de um documento para começar. Se não tem nada para enviar, diga um tema, por exemplo a inspeção em sete etapas ou recuperação de derrapagem, e o Bo escreve um simulado a partir disso. Comece grátis.