Alabama CDL General Practice Test

These questions are part of the practice quiz. Start practicing

• The air compressor governor controls:
• What condition can occur if oil and water collect in the air tanks?
• With S-cam drum brakes, when the brake chamber fills with air, air pressure pushes the push rod out, moving the ___ and thus rotating the _____?
• The Anti-Lock Braking System (ABS) activates when?
• Which device measures the pressure in the air tanks?
• During the final air brake check, which condition indicates a potential problem?
• What is the primary purpose of the tractor protection valve?
• Which fluid levels are typically checked during a pre-trip?
• How should wheel chocks be used to prevent movement when parked?
• If the ABS warning light stays on while driving, what should you do?
• Which action triggers air into the brake chamber?
• During normal driving, spring brakes are normally held back by which force?
• When parking on an incline, which wheel chock arrangement is correct?
• During a pre-trip inspection, which steering-related items should you verify?
• In a braking system with spring brakes, what happens when air pressure is released?
• Which statement about GCVWR is true?
• In a dual air brake system, if one system loses air pressure, what will happen?
• How can you verify the low air pressure warning light is functioning?
• Excessive heat caused by overuse of the service brakes can cause the brakes to?
• After the initial drop, the maximum leakage rate per minute for combination vehicles is:
• Why is speed management important when taking curves in a CMV?
• What is the correct sequence for a safe lane change with a large vehicle?
• If you detect a brake hose leak while driving, what is the proper action?
• If the low pressure warning signal is not working, what may occur in a single circuit air system?
• Modern air brake systems combine three different systems. They are the service brake, parking brakes, and the?
• Overloading a CMV affects performance in which of the following ways?
• If your vehicle has an alcohol evaporator, every day during cold weather, you should:
• When can you leave your truck unattended without first applying the parking brakes or chocking the wheels?
• Which component connects the trailer to the tractor and allows it to pivot?
• In S-cam drum brakes, which component is shaped like the letter S?
• Why is proper weight distribution important for stability?
• The stopping power of the spring brakes depends on the adjustment of the service brake. Which factor does this refer to?
• Which statement best describes the safe approach to dealing with a hazard in your lane if you cannot avoid it?
• To test the air service brakes you should:
• What does the application pressure gauge indicate?
• In an air-brake system, what factor ensures the spring brakes remain retracted during normal operation?
• What is the general rule for following distance in safe CDL operation?
• What should you verify about trailer doors before transport?
• The three main brake systems in modern air brake setups are service brakes, parking brakes, and the ______ brakes.
• What risk does a high center of gravity pose when taking curves in a CMV?
• Oil and water typically collect in which component of heavy vehicle air systems?
• What is the purpose of safety chains on a trailer?
• In normal conditions, what is the minimum following distance for a heavy vehicle?
• If air pressure is insufficient to hold back the spring brakes, which brake component may engage to slow the vehicle?
• After the initial drop, the maximum leakage rate per minute for single-vehicle air brakes is:
• Converter dolly with ABS is indicated by what warning indicator?
• Before leaving a heavy vehicle unattended, which steps should you perform?
• What should the dashboard indicator lights tell you before starting?
• Which tire conditions require you to stop the trip or not drive?
• If the air compressor develops a leak, what keeps air in the tanks?
• In which position should you NOT apply the parking brake?
• What is the function of the brake camshaft in S-cam drum brakes?
• Air Brakes use?
• Slack adjusters are an important part of your air brake system because they allow you to
• If a trailer brake hose shows signs of leakage during operation, what is the immediate safety step?
• What is the most important thing to remember about hard braking?
• Which factors can contribute to brake fade or brake failure?
• Which statement best describes the impact of overloading a CMV?
• If the ABS fails, which statement is true about your brake function?
• During brake system failure, what does the emergency brake system utilize?
• What is the difference between gross vehicle weight rating and gross combination weight rating?
• If you must stop on the roadside, which safety device is specifically used to warn other drivers?
• What is the most common type of foundation brakes found on heavy vehicles?
• A straight truck or bus air brake system should not leak at a rate of more than ___ psi per minute with the engine off and the brakes released.
• The brake pads should be ____ for the brakes to be on?
• When you press the brake pedal, what happens in an air brake system?
• Slack adjusters should not have any more than____ of play?
• If air tanks are not drained, what is a potential brake problem?
• Which statement about parking brakes is accurate?
• During a pre-trip, what should you look for in the exhaust system?
• What is the purpose of an alcohol evaporator in air brake systems?
• Which device controls when air is pumped into the air tanks?
• Which part of the air brake system is described as keeping air in the tractor or truck brake system?
• If you must make an emergency stop, you should brake so that you:
• Tractor and straight truck spring brakes will come fully on when air pressure drops to a range of:
• The anti-lock braking system (ABS) is designed to do what during hard braking?
• What should you check about the trailer brakes and slack adjusters?
• Which statement best describes braking to avoid wheel lock during heavy braking?
• What is the function of the modulating control valve in braking systems?
• Which component prevents backflow and keeps air in the tanks when the compressor stops?
• What steps should you take when leaving the cab to perform a post-trip inspection?
• In an S-cam drum brake system, which component is directly moved by the push rod as air pressure acts on the brake chamber?
• Under what conditions are front-wheel brakes good?
• What is a common consequence of fanning the brake pedal?
• What should you do if a warning light remains active before starting the vehicle?
• If your air tanks do not have an automatic drain, when should you drain the air tanks?
• Where is the ABS indicator lamp located on a converter dolly with ABS?
• In a dual air brake system with minimum sized air tanks, how many seconds should it take to build from 85 to 100 psi?
• What are two key components of the steering system you should inspect?
• How should you check tire inflation safely?
• In adverse conditions, how should you adjust following distance?
• How should a tarped load on a flatbed be secured?
• When the low air pressure warning is activated, the recommended action is to:
• When the spring brakes are on, which action is appropriate?
• What is the primary purpose of the pre-trip inspection?
• If oil and water collect in the air tanks, what could happen to the brakes?
• If you encounter a hazard in your lane, what is the recommended action?
• Which vehicle must have low air pressure warning signals?
• What is a 'no-zone' in trucking?
• What is the correct sequence for uncoupling a trailer?
• Which action best describes the proper approach to a safe lane change with a large vehicle?
• On a long or steep downgrade, once you have reached your safe speed, brake until you are traveling _____ lower than the safe speed
• Vehicles with air brakes must have:
• Which actions best reduce the risk of hydroplaning on wet roads?
• On a long downhill grade, how should you manage braking?
• Slack adjusters are an important part of your air brake system because they allow you to adjust the brakes to ensure they are safe.
• What should be included in your emergency equipment kit?
• When should you use the parking brake?
• Which component within a drum brake system presses against the drum to slow the vehicle?
• To apply the parking brake under normal conditions,
• How should cargo be secured to prevent movement?
• The parking brake control
• For the stopping distance at 55 mph, which choice is correct?
• In an air brake system, what is the brake pedal's primary function?
• At 55 mph under ideal conditions, stopping distance would be more than 400 feet.
• When ABS is not available and you need to stop quickly, which braking technique is recommended?
• Which action best prevents cargo from shifting during transit?
• In a drum brake system, the S-cam's role is to push the brake shoes outward against the drum.
• How can you tell if your vehicle is equipped with ABS?
• What can cause brakes to fail or fade?
• What is the general rule of safe driving for CDL operators?
• What action is recommended when crossing a bridge during high winds?
• To test the static air leakage rate, you should
• Maximum leak rate per minute with engine off and brakes released?
• What activates the stop switch?
• If your truck has a dual parking control valve, what does it allow you to do?
• What is the typical fully charged pressure for an air brake system?
• In the event of brake system failure, the emergency brake system uses _____ to stop the vehicle?
• What battery-related issue should you look for during inspection?
• What is the primary purpose of dash-mounted gauges?
• What driving technique helps prevent brake fade on long downgrades?
• The stop switch is activated by which of the following?
• What should you do if you observe fluids leaking under the vehicle during a pre-trip?
• What is the purpose of the brake test during pre-trip?
• Which statement about the parking brake is correct?
• What should you do if you encounter a hot engine or fluid leak while refueling?
• When driving an over-length vehicle, what is a critical consideration?
• The supply pressure gauge indicates the pressure in which part of the system?
• If the low air pressure warning comes on, what is the first action you should take?
• Why is an S-cam drum brake called an S-cam?
• Brake drums must not have cracks longer than what fraction of the width of the friction area?
• On a long downgrade, how do the brakes function?
• What approach helps avoid hitting pedestrians or cyclists when turning?
• What action is required at railroad crossings when signs or signals indicate?
• When should you use headlights and reflective devices?
• Which of the following is not part of the drum brake?
• What action should you take regarding a battery issue found during inspection?
• Which of the following describes brake lag distance as a factor in stopping distance for air brakes compared with hydraulic brakes?
• During your final air brake check, if the air pressure does not build up fast enough, what may happen during driving?
• What is the function of the suspension system?
• Which practice helps prevent cargo from shifting during transit?
• If the spring brakes are on, when should you press the brake pedal?
• The first thing to do when a low air pressure signal comes on is:
• If ABS is not functioning, what will you observe about braking?
• Which item is commonly required as part of a CMV emergency kit?
• When driving on grades, which braking method should you use to slow gradually?
• What steps should you take to recover from a skid in a CMV?
• Which condition should you avoid using the parking brake?
• Which statement about ABS is true?
• Which item is not typically part of a pre-trip exterior walk-around?
• How would you check your trucks slack adjusters?
• Which statement is NOT true about braking in a tractor-trailer with ABS?
• The air compressor will stop pumping air to the air brakes at what pressure?
• Which statement describes securing tarps on a flatbed?
• Which of the following is essential for safe operation of air-brake equipped vehicles?
• What is true about the emergency brakes in a modern air brake system?
• In an air braking system, which device directly regulates the pressure used to apply the brakes?
• What should you do if you notice a coolant leak while parked?
• What happens to air in the brake chamber when the parking brake is engaged?
• If you vehicle has a dual air brake system and a low air pressure warning comes on for only one system, what should you do?
• When descending a long grade, the braking system is designed to do what in relation to engine braking?
• What is the name of the brake system that applies when the driver uses the brake pedal?
• Which component is primarily responsible for adjusting the free play in the braking system?
• Which parts comprise an air brake system on a CMV?
• What is the best way to test your vehicle's low air pressure warning system?
• If you need to stop quickly and your vehicle lacks anti lock brakes (ABS), you can use:
• You know your brakes are fading when which of the following is true?
• What is the purpose of the kingpin on a semi-trailer?
• Which statement about fluid checks during a pre-trip is true?
• Air brake equipped vehicles must have:
• What can legally hold a parking or emergency brake in position for a truck, truck tractor or bus?
• Overheating due to excessive service brake use may lead to expansion of which component?
• What is the primary purpose of dash-mounted gauges?
• Which statement describes GVWR according to the given material?
• The modulating control valve allows you to control the:
• The driver must be able to see a warning that is given before air pressure in the service air tanks falls below:
• What does a dual parking control valve permit you to do with spring brakes?
• Air loss in a straight truck or bus with the engine off and brakes applied should not exceed how many psi in one minute?
• To check the free play of manual slack adjusters on S-cam brakes you should:
• Before connecting a trailer, which components should you inspect to ensure proper engagement?
• Which strategy best reduces blind spots on a heavy vehicle?
• In controlled braking, you should:
• Which device shows the pressure available for braking?
• During a walk-around exterior inspection, which major systems should be checked?
• Regularly draining the air tanks helps prevent which problem?
• Which gauge reading is most important for assessing air brake readiness?
• During a pre-trip inspection, which statement about the trailer doors is correct?
• Oil and water typically collect in which component of the air system?
• Which of the following is NOT a component of an air brake system?
• How should you respond if a vehicle behind you signals with a horn?
• Why do air brakes take longer to stop than hydraulic brakes?
• Brake lag distance at 55 mph is how many feet?
• What is the correct protocol for uncoupling a trailer?
• Repeatedly pressing and releasing (fanning) the brake pedal may result in?
• What is the S-cam used for?
• Spring brakes are?
• How do you check for air leaks in an air brake system?