Alabama CDL Class A Permit Practice Test

These questions are part of the practice quiz. Start practicing

• Which lights cannot be checked at the same time?
• If your vehicle has an alcohol evaporator, it is there to
• During a routine vehicle inspection, which set of lights cannot be checked all at once?
• What term describes a commercial vehicle swinging wide in a turn?
• What is the recommended downhill braking technique?
• Which of the following is NOT considered part of the three main air brake systems?
• All air-braked vehicles must have which device?
• When braking in an emergency, the ability to steer means:
• Which action is correct when parking an air-braked vehicle?
• On a steep downgrade, if you have reached a safe speed of 40 mph, you should apply the service brakes until your speed reaches what?
• The distance you should look ahead of your vehicle while driving at low speeds is:
• A heavy or fast vehicle increases the required braking heat because
• During a leak test for an air brake system, the engine should be off and the brakes released. Which option describes this condition?
• During normal driving, spring brakes are usually held back by which force?
• Which action is not recommended for a left turn?
• ABS uses sensors and computers to sense what?
• Retarders can be used:
• Which of these statements about speed management is true?
• In emergency stab braking, what is the correct sequence of actions?
• What is the purpose of the low air pressure warning in an air brake system?
• In air-braked vehicles, when should the parking brake be used?
• Which action best explains why alcohol affects driving ability?
• At highway speed, which distance is the recommended look-ahead distance?
• On a snow-packed road, by how much should you reduce your speed?
• If you do not have the hazardous materials endorsement and are asked to haul placarded hazardous materials, what should you do?
• Which statement about look-ahead distance at low speed is correct?
• Which type of cargo requires extra caution on curves?
• While driving through a work zone, when should you reduce your speed?
• If your truck or bus has dual parking control valves, you can use pressure from a separate tank to
• Which statement about tires is true?
• Which item is not listed as optional safety equipment for many trucks?
• The application pressure gauge shows you how much pressure
• Why do air brakes take longer to stop than hydraulic brakes?
• If the spring brakes are on, when should you push the brake pedal?
• At what psi is the safety valve in an air brake system set to relieve pressure?
• When you must perform an emergency stop, braking should be done in a way that allows you to:
• A slack adjustor probably needs adjustment if it moves more than how much when you pull on it?
• The road becomes very slippery due to glare ice. Which of these is a good thing to do in such a situation?
• Which of these statements about cargo is true?
• Which of these statements about backing a heavy vehicle is true?
• Which statement accurately describes engine braking on downgrades compared to service braking?
• Which statement accurately describes ABS?
• Some air brake systems have an alcohol evaporator. What may happen if you don't keep the unit filled with alcohol?
• When driving through work zones, you should:
• Which of these does not provide extra gears on some trucks?
• Brake fade is indicated by which symptom?
• Why is it important to use lower gears when driving downhill?
• What is the first thing you should do if your brakes fail while going down a hill?
• Brake lag in air braking systems contributes to what effect on stopping distance?
• For a newer truck with a manual transmission, what gear is appropriate for a long downhill grade?
• Which components add up to the total stopping distance for a heavy truck or bus?
• When road conditions are slippery, what is the recommended way to make turns?
• What should you do if the car behind you disappears from your rear-view mirror just before changing lanes?
• Aggressive driving is defined as:
• Which of these does not affect your choice of gears?
• What keeps an engine cool in hot weather driving?
• What is counter steering?
• When driving in cold weather, your tire tread depth should do what?
• Total stopping distance for air brakes is longer than hydraulics because of which factor?
• Modern air brake systems combine three different systems. Which are they?
• Regarding vehicle fires, which action is true?
• Which of the following is not a characteristic of a front tire failure?
• Within how many miles of starting a trip must drivers check the securement of the cargo?
• If you have been drinking alcohol, before you drive, you should
• If you are stopped on the roadside at night, a safe action is to
• In an air brake system, the S-cam serves what purpose?
• In hot weather, how often should you inspect your tires?
• Where is cargo blocking typically used?
• If you encounter an aggressive driver, the safest first action is to
• Backing a commercial vehicle is:
• If you lack hazmat endorsement and are asked to haul placarded hazmat, you should do what?
• A slack adjustor movement test indicates adjustment is needed if the movement is more than which value?
• The use of brakes on a long and/or steep downgrade is only a supplement to which braking method?
• If you react 1/2 slower, your chances of a crash can do what?
• What is a primary function of the ABS system on a vehicle?
• In a scenario where a truck has a lower speed limit, what should you do to stay safe?
• What is a key reason to check your mirrors and blind spots before changing lanes?
• Why is it important to shift gears correctly?
• To determine the blood alcohol concentration for a person, it is necessary to know
• At what psi should the low air pressure warning come on before the tanks fall below a certain pressure?
• After starting the engine, what should the coolant temperature gauge do?
• You should avoid driving through deep puddles or flowing water. But if you must, which of these steps can help keep your brakes working?
• In low visibility conditions such as dawn, dusk, rain, or snow, how can you help other drivers see you?
• Which term describes a commercial vehicle that tends to swing wide in a turn?
• Why should you limit the use of your horn?
• To check the free play of manual slack adjustors on s-cam brakes, you should park on which setup?
• On a hill or curve on a divided highway, how far back should you place the rear-most triangle?
• How can sleep debt be paid off?
• Which of the following is not a proper time to apply the parking brakes?
• If your vehicle has hydraulic brakes and the brake pedal goes to the floor on a level road, which statement is true?
• If your vehicle has an alcohol evaporator, what daily check is required in cold weather?
• Emergency controlled braking is when you:
• Which statement about drinking alcohol and driving is true?
• If one side of a dual air system loses pressure, which statement best describes the braking impact?
• What does the bridge formula do when axles are placed close together?
• How often should you drain the water and oil from your air tanks?
• If you are being tailgated, you should:
• Which statement about brake heat and stopping is true?
• What is the correct way to address sleep debt according to the material?
• If hydraulic brakes fail while driving, what action should you take?
• When driving on grades, what is the best way to determine a safe speed?
• Which maintenance action is most directly linked to preventing engine overheating in hot weather?
• The term defensive driving describes drivers who do what?
• If your truck's air compressor has its own oil supply, when should you first check the oil level?
• In drum brake systems, which component causes the shoes to press against the drum?
• The most common type of foundation brake found on heavy vehicles is the
• Having ABS on only the tractor will
• Which of these is not a good rule to follow when caring for the injured at an accident scene?
• Which factor should you base your safe grade speed on?
• Which transmission type is said to not provide extra gears on some trucks?
• What is the main safety purpose of knowing escape ramp locations on your route?
• Under nighttime driving conditions, you should switch to low beams when an oncoming vehicle is within 500 feet.
• If you must cross into the oncoming lane as you make a turn, you should
• At what psi should the air compressor stop pumping?
• Which statement about overhead clearance is true?
• Which item is NOT typically checked in a pre-trip inspection?
• What happens to a straight truck if it experiences a front wheel skid?
• Which situation could indicate you must perform an emergency stop due to air pressure?
• When driving at night, you should use your low beams when an oncoming vehicle is within how many feet?
• During testing, the hold time for 85-100 psi in a properly functioning dual air system should be what duration?
• If hazardous materials fires occur and you are unsure what to use to extinguish them, what should you do?
• Which statement best describes the cargo loading principle?
• What should you do if a car coming toward you at night keeps its high beams on?
• The supply pressure gauge shows how much pressure
• Which statement about hours of service is true?
• The spring brakes on trucks will bring it to a stop automatically when air pressure falls to what range?
• Placards on a vehicle must be:
• During a pre trip inspection, which statement about brake shoes is true?
• Your brakes can get wet when you drive through a heavy rain. What can this cause when the brakes are applied?
• If you look in your mirror and then plan to change lanes, you no longer see a car approaching from the rear. You should:
• Which action is appropriate to alert others when you see a hazard ahead?
• If a straight truck goes into a front wheel skid, what will happen?
• During an air brake system test with the engine off, the allowable loss is:
• In an air brake system, the service brake provides what function?
• What is a danger of crossing tracks on a dirt road?
• In a well-maintained air brake system, at what pressure should the air compressor start pumping?
• Hazardous material placards must be visible from how many sides?
• By how much does stopping distance increase when you double your speed?
• When driving on roads where truck speed limits are lower than cars, you should
• Before entering a downhill-curving off ramp with a heavy vehicle, what should you do with your speed?
• What action will help prevent a fire?
• On a snow-packed road, you should reduce your speed by at least which amount?
• Which component indicates the amount of air pressure in the system?
• Who has the authority to inspect a truck or bus and potentially place it out of service?
• What is the most important reason to inspect your truck or bus?
• At highway speed, how far ahead should you look to identify hazards?
• Which statement best reflects stopping distance for a 55 mph truck with air brakes under ideal conditions?
• Under normal operation, how is the parking brake engaged in an air brake system?
• The brake system that applies and releases the brakes when the driver uses the brake pedal is called the
• How should you correct a rear wheel acceleration skid?
• When a medicates affects driving, the safest choice is to
• What does emergency braking mean?
• How does vehicle weight affect stopping distance?
• In heavy traffic with a 55 mph limit, which speed is commonly considered safest?
• To know when to shift gears, you should monitor which instrument on the dash?
• When you downshift for a curve, when should you do so?
• Which instrument can be used to tell you when to shift gears?
• When exiting a highway via an off ramp that curves downhill while driving a heavy vehicle, what should you do before the curve?
• In bad weather, when following a large vehicle, you should
• If your ABS is not working, you should:
• When you see a hazard in the roadway ahead, what should you do to warn others?
• In an air brake system, the brake pedal controls which of the following?
• What is emergency stab braking?
• Can federal inspectors inspect your truck or bus?
• If air pressure does NOT build up to normal within the correct amount of time:
• A straight truck or bus air brake system should not leak more than how many psi per minute with the engine off and brakes released?
• Which statement is identified as a good thing to do when driving at night?
• The braking power of the spring brakes depends on what condition?
• Which safety item, when properly charged, helps prevent a fire?
• What shape must the hazard label have on hazardous materials?
• If a hill or curve keeps drivers behind you from seeing the vehicle within 500 feet, what should you do with the reflective triangle?
• Which statement best describes the bridge formula's effect on axle weight?
• When driving a 40-foot vehicle at 35 mph, what is the least amount of space you should keep behind the vehicle in front of you?
• Which statement about alcohol evaporators is true?
• The low air pressure warning is a signal of which condition?
• What holds the parking brakes on trucks when air pressure is removed?
• The practice of watching for hazards and preparing for them is called what?
• Which statement about emergency braking is not true?
• When a doctor prescribes medication for you and you know you will be driving, you should
• The use of drugs in driving can lead to what outcomes?
• When steering to avoid a crash, what is the best practice?
• A car cuts in front of you creating a hazard. Which action should you not take?
• Optional safety equipment may include emergency phone numbers, tire chains and:
• If a dual air system has one system low on pressure, what is a likely braking outcome?
• Which statement best describes the role of the spring brakes?
• Which statement about downhill control and wind effects is supported by the material?
• The braking power of spring brakes is affected by the adjustment of which component?
• If you are not sure what to use to put out hazardous materials fires, you should:
• A driver must check cargo securement within how many miles after starting a trip?
• The application pressure gauge indicates
• During a winter weather inspection, which system should receive extra attention?
• If the speed limit is 55 mph but traffic is moving at 35 mph, what is the safest speed for you to travel?
• What is the most important thing to remember about emergency braking?
• ABS changes:
• Which vehicle will be most affected by strong winds?
• The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than how much?
• When a tire blows out at highway speed, what typical sensation is experienced?
• Excessive use of the service brakes can lead to overheating which can cause which result?
• What is the principle to remember about loading cargo?
• Merging onto a road is safest if you:
• During winter weather inspection, attention to which system helps prevent exhaust issues?
• The most important thing to do when the low air pressure warning comes on is
• How should you check that your service brakes are working properly?
• When driving down a mountain, what gear should you use?
• Cargo blocking is typically used on which parts of the cargo?
• Escape ramps should be used by which drivers?
• On a level highway at 50 mph with no other traffic, a tire blows out. What should you do first?
• Parking or emergency brakes of trucks and buses can be legally held on by
• Before driving in mountains, what should you know?
• In a properly functioning dual air system, the pressure should hold from 85 psi to 100 psi for how long?
• You should use your mirrors to check
• Which driving scenario most clearly requires using lower gears for safety?
• Under ideal conditions, a truck with air brakes going 55 mph would require a stopping distance of more than how many feet?
• Merging onto a road is safest if you wait for what?
• During the walk-around inspection, which item is NOT a brake check you normally perform?
• The safety valve in an air brake system is designed to:
• Which factor changes a vehicle's height and can affect overhead clearance?
• What distance is cited for the reflective triangle to provide adequate warning when visibility is blocked?
• Which statement about brakes is true?
• If you double your speed, your stopping distance increases by how many times?
• If a tire blows out on a highway with no traffic nearby, the first step is to:
• Which statement about shipping hazardous materials is true?
• If you are being tailgated, you should do which of the following?
• When you are parked at the side of the road at night, you must