Do You Know How To Use Air Break?

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  • 1/140 Questions

    When inspecting the air compressor drive belt, the driver must look for?

    • Loose belt
    • Cut belt
    • Frayed belt
    • All of the above
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About This Quiz

In the quiz below we, look and want to ascertain that you know how to use the air breaks. Despite of the answers you are going to give and the results, it is certain that you are going to learn.

Do You Know How To Use Air Break? - Quiz

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  • 2. 

    Air compressor cut-in pressure must never be less than?

    • 414 kPa (60 psi)

    • 828 kPa (120 psi)

    • 552 kPa (80 psi)

    • 932 kPa (135 psi)

    Correct Answer
    A. 552 kPa (80 psi)
    Explanation
    The cut-in pressure of an air compressor refers to the minimum pressure at which the compressor starts running to build up pressure in the system. It is important for the cut-in pressure to be set at an appropriate level to ensure efficient and safe operation of the compressor. A cut-in pressure that is too low may cause the compressor to start too frequently, leading to excessive wear and tear on the equipment. On the other hand, a cut-in pressure that is too high may result in the compressor running for longer periods, consuming more energy and potentially causing damage to the system. Therefore, the correct answer is 552 kPa (80 psi) as it provides a balanced level of pressure for the compressor to start and operate effectively.

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  • 3. 

    When an air brake brake system is defective you must?

    • Drive the vehicle slowly on the highway

    • Drive the vehicle to the nearest service station

    • Drive the vehicle back to the terminal

    • Not drive or operate the vehicle on any road or highway

    Correct Answer
    A. Not drive or operate the vehicle on any road or highway
    Explanation
    When an air brake brake system is defective, it is unsafe to drive or operate the vehicle on any road or highway. This is because the brakes are a critical component of a vehicle's safety system, and if they are not functioning properly, it can lead to accidents or loss of control. Therefore, it is necessary to refrain from driving the vehicle until the brake system is repaired or replaced.

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  • 4. 
    When inspecting the, the driver must look for? - ProProfs

    When inspecting the, the driver must look for?

    • Loose belt

    • Cut belt

    • Frayed belt

    • All ot the above

    Correct Answer
    A. All ot the above
    Explanation
    The driver must inspect the belt for any signs of damage or wear. A loose belt can lead to inefficient operation of the vehicle's systems. A cut belt can cause complete failure of the belt, resulting in loss of power to various components. A frayed belt indicates that it is worn out and may snap at any moment. Therefore, the driver should look for all of these issues to ensure the belt is in good condition and prevent any potential problems while driving.

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  • 5. 

    When an air brake system is defective you must?

    • Drive the vehicle slowly on the highway

    • Drive the vehicle to the nearest service station

    • Drive the vehicle back to the terminal

    • Not drive or operate the vehicle on any road or highway

    Correct Answer
    A. Not drive or operate the vehicle on any road or highway
    Explanation
    When an air brake system is defective, it is unsafe to drive or operate the vehicle on any road or highway. This is because the air brake system is critical for the safe operation of the vehicle, especially in terms of stopping and slowing down. If the air brake system is defective, it can lead to a loss of braking power, making it difficult to control the vehicle and potentially causing accidents. Therefore, it is important to not drive or operate the vehicle until the air brake system is repaired or replaced.

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  • 6. 

    When an air brake system is defective you must?

    • Drive the vehicle slowly on the highway

    • Drive the vehicle to the nearest service station

    • Drive the vehicle back to the terminal

    • Not drive or operate the vehicle on any road or highway

    Correct Answer
    A. Not drive or operate the vehicle on any road or highway
    Explanation
    When an air brake system is defective, it is unsafe to drive or operate the vehicle on any road or highway. This is because the air brake system is a critical component of a commercial vehicle's braking system, and a defect in this system can result in a loss of braking power. Driving with a defective air brake system poses a significant risk to the driver, passengers, and other road users. Therefore, it is essential to refrain from driving the vehicle until the air brake system is repaired and deemed safe for operation.

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  • 7. 

    Drivers must be careful when conducting an inspection of the air brake system to avoid?

    • Unexpected vehicle movement

    • Compressed air exhausting from components

    • Moving vehicle parts

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    When conducting an inspection of the air brake system, drivers must be careful to avoid unexpected vehicle movement, compressed air exhausting from components, and moving vehicle parts. This is because any of these scenarios can be potentially dangerous and can lead to accidents or injuries. Therefore, it is important for drivers to exercise caution and take necessary precautions while inspecting the air brake system to ensure their safety and the safety of others on the road.

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  • 8. 

    When an air brake system is defective you must?

    • Drive the vehicle slowly on the highway

    • Drive the vehicle to the nearest service station

    • Drive the vehicle back to the terminal

    • Not drive or operate the vehicle on any road or highway

    Correct Answer
    A. Not drive or operate the vehicle on any road or highway
    Explanation
    When an air brake system is defective, it is unsafe to drive or operate the vehicle on any road or highway. Air brakes are an essential component for the safe operation of a vehicle, and if they are not functioning properly, it can lead to a loss of control and potentially cause accidents. Therefore, it is necessary to refrain from driving the vehicle until the air brake system is repaired or replaced.

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  • 9. 

    When a vehicle's brakes do not comply with the Ontario Highway Traffic Act and regulations?

    • Only the driver may be charged

    • Only the vehicle operator may be charged

    • The driver will not be charged

    • Both the vehicle operator and the driver may be charged

    Correct Answer
    A. Both the vehicle operator and the driver may be charged
    Explanation
    When a vehicle's brakes do not comply with the Ontario Highway Traffic Act and regulations, both the vehicle operator and the driver may be charged. This means that both the person operating the vehicle and the person in control of the vehicle at the time of the offense can be held responsible for the non-compliant brakes. It is important for both the driver and the vehicle operator to ensure that the brakes meet the required standards to avoid any potential charges or penalties.

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  • 10. 

    A reliable method for inspecting brake adjustment on a brake having an exposed push rod is?

    • Measuring the applied push rod stroke

    • Checking air pressure drop on brake application

    • Checking for a 90-degree angle when brakes are applied

    • Rolling the vehicle forward and applying the brakes

    Correct Answer
    A. Measuring the applied push rod stroke
    Explanation
    The most reliable method for inspecting brake adjustment on a brake with an exposed push rod is by measuring the applied push rod stroke. This involves measuring the distance that the push rod moves when the brakes are applied. By comparing this measurement to the manufacturer's specifications, one can determine if the brake adjustment is within the acceptable range. This method provides a direct and accurate assessment of the brake adjustment, making it a reliable choice for inspection.

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  • 11. 

    When a low air pressure warning device activates, the driver must?

    • Drive the vehicle until brakes come on automaticlly

    • Come to a safe stop as soon as possible

    • Replace the warning device

    • Drain the moisture out the supply (wet) tank

    Correct Answer
    A. Come to a safe stop as soon as possible
    Explanation
    When a low air pressure warning device activates, it indicates that the air pressure in the braking system is below the safe level. This can lead to a loss of braking power, making it unsafe to continue driving. Therefore, the driver must come to a safe stop as soon as possible to avoid any potential accidents or further damage to the vehicle.

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  • 12. 

    A reliable method for inspecting brake adjustment on a brake having an exposed push rod is?

    • Measuring the applied push rod stroke

    • Checking air pressure drop on brake application

    • Checking for a 90-degree angle when brakes are applied

    • Rolling the vehicle forward and applying the brakes

    Correct Answer
    A. Measuring the applied push rod stroke
    Explanation
    Measuring the applied push rod stroke is a reliable method for inspecting brake adjustment on a brake with an exposed push rod. This involves measuring the distance the push rod moves when the brakes are applied. If the stroke is within the recommended range, it indicates that the brake adjustment is correct. However, if the stroke is too long or too short, it indicates that the brake adjustment needs to be adjusted. This method allows for a direct measurement of the push rod stroke, providing a reliable way to assess brake adjustment.

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  • 13. 

    A reliable method for inspecting brake adjustment on a brake having an exposed push rod is?

    • Measuring the applied push rod stroke

    • Checking air pressure drop on brake application

    • Checking for a 90-degree angle when brakes are applied

    • Rolling the vehicle forward and applying the brakes

    Correct Answer
    A. Measuring the applied push rod stroke
    Explanation
    Measuring the applied push rod stroke is a reliable method for inspecting brake adjustment on a brake with an exposed push rod. This involves measuring the distance that the push rod moves when the brakes are applied. By comparing this measurement to the manufacturer's specifications, one can determine if the brake adjustment is within the recommended range. This method allows for a direct assessment of the brake's performance and can help identify any potential issues with the brake system.

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  • 14. 

    When measuring the applied push rod stroke on brake having exposed push rods, air pressure must be between?

    • 690 and 828 kPa (100 and 120 psi)

    • 621 and 690 kPa (90 and 100 psi)

    • 690 and 932 kPa (100 and 135 psi)

    • 414 and 828 kPa (60 and 120 psi)

    Correct Answer
    A. 621 and 690 kPa (90 and 100 psi)
    Explanation
    The correct answer is 621 and 690 kPa (90 and 100 psi). This range of air pressure is required when measuring the applied push rod stroke on a brake with exposed push rods. It is important to have the correct air pressure to ensure accurate measurements and proper functioning of the brake system.

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  • 15. 
    When a driver finds a brake that is out of adjustment? - ProProfs

    When a driver finds a brake that is out of adjustment?

    • The vehicle must not be driven or operated on any road or highway

    • It must be corrected before entering an inspection station

    • It must be corrected at the next annual inspection

    • It must be corrected the next time the vehicle is serviced

    Correct Answer
    A. The vehicle must not be driven or operated on any road or highway
    Explanation
    If a driver finds a brake that is out of adjustment, the correct course of action is to not drive or operate the vehicle on any road or highway. This is because an improperly adjusted brake can affect the vehicle's ability to stop effectively, posing a safety risk to the driver, passengers, and other road users. It is important to address the issue before using the vehicle again to ensure safe operation.

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  • 16. 

    A reliable method for inspecting brake adjustment on a brake having an exposed push rod is?

    • Measuring the applied push rod stroke

    • Checking air pressure drop on brake application

    • Checking for a 90 degree angle when brakes are applied

    • Rolling the vehicle forward and applying the brakes

    Correct Answer
    A. Measuring the applied push rod stroke
    Explanation
    To inspect brake adjustment on a brake with an exposed push rod, measuring the applied push rod stroke is a reliable method. By measuring the distance the push rod moves when the brakes are applied, one can determine if the brake adjustment is within the recommended range. This method allows for a quantitative assessment of the brake adjustment, providing a more accurate and objective evaluation compared to other options such as checking for a 90-degree angle or observing air pressure drop. Rolling the vehicle forward and applying the brakes may not provide an accurate assessment of the brake adjustment as it relies on subjective observations.

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  • 17. 

    A vehicle's brakes must do more work when?

    • The vehicle goes slower

    • The vehicle goes faster

    • The vehicle carries less weight

    • None of the above

    Correct Answer
    A. The vehicle goes faster
    Explanation
    When a vehicle goes faster, the brakes must do more work because the vehicle's momentum increases with speed. As the vehicle accelerates, it builds up more kinetic energy, which needs to be dissipated when the brakes are applied. This requires the brakes to exert more force to slow down or stop the vehicle effectively. Therefore, the correct answer is that the vehicle goes faster.

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  • 18. 

    The minimum and maximum pressure settings prescribed in the Ontario Highway Traffic Act and regulations are 552 kPa (80 psi) and 932 kPa (135 psi)?

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The given statement is true. According to the Ontario Highway Traffic Act and regulations, the minimum and maximum pressure settings prescribed are 552 kPa (80 psi) and 932 kPa (135 psi) respectively. This means that any pressure below 552 kPa or above 932 kPa would be considered outside the legal limits set by the regulations.

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  • 19. 

    Air brake systems must comply with the Ontario Highway Traffic Act and regulations?

    • Only when vehicle is being tested

    • Only during an annual safety inspection

    • Only when they are inspected by enforcement personnel

    • At all times when being driven or operated on any road or highway

    Correct Answer
    A. At all times when being driven or operated on any road or highway
    Explanation
    Air brake systems must comply with the Ontario Highway Traffic Act and regulations at all times when being driven or operated on any road or highway. This means that the air brake systems on vehicles must meet the requirements set forth by the Act and regulations whenever they are in use on public roads. This ensures the safety and proper functioning of the air brake systems, which are essential for the safe operation of the vehicle. Compliance with these regulations is necessary to prevent accidents and maintain the overall safety of the roadways.

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  • 20. 

    When an air brake system is defective you must?

    • Drive the vehicle slowly on the highway

    • Drive the vehicle to the nearest service station

    • Drive the vehicle back to the terminal

    • Not drive or operate the vehicle on any road or highway

    Correct Answer
    A. Not drive or operate the vehicle on any road or highway
    Explanation
    When an air brake system is defective, it is unsafe to drive or operate the vehicle on any road or highway. Defective air brakes can lead to a loss of braking power, making it difficult to stop the vehicle safely. Continuing to drive in such conditions can pose a significant risk to the driver, passengers, and other road users. It is crucial to address the issue promptly by seeking professional help or having the vehicle towed to a service station for repairs.

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  • 21. 

    Air brake systems must comply with the Ontario Highway Traffic Act and regulations?

    • Only when the vehicle is being tested

    • Only during an annual safety inspection

    • Only when they are inspected by enforcement personnel

    • At all times when being driven or operated on any road or highway

    Correct Answer
    A. At all times when being driven or operated on any road or highway
    Explanation
    Air brake systems must comply with the Ontario Highway Traffic Act and regulations at all times when being driven or operated on any road or highway. This means that the air brake systems must meet the requirements and standards set by the law and regulations, and they must be in proper working condition whenever the vehicle is being driven or operated on any road or highway. Compliance with these regulations ensures the safety of the vehicle and other road users.

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  • 22. 

    The air that exhausts from an air brake system can carry?

    • Dirt and dust

    • Moisture

    • Oil

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The air that exhausts from an air brake system can carry dirt and dust, moisture, and oil. This is because the air in the system can pick up these substances as it circulates through the brake components. Dirt and dust can enter the system through various openings, moisture can condense in the system due to temperature changes, and oil can be present in the system due to leaks or lubrication. Therefore, the exhaust air from an air brake system can contain all of these substances.

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  • 23. 

    Disc brake components include?

    • Rotors and Brake drums

    • Camshafts and Brake Calipers

    • Camshafts and Brake shoes

    • Calipers and Rotors

    Correct Answer
    A. Calipers and Rotors
    Explanation
    The correct answer is Calipers and Rotors. Disc brakes consist of two main components: calipers and rotors. The calipers are responsible for squeezing the brake pads against the rotors, creating friction and slowing down the vehicle. The rotors, also known as brake discs, are attached to the wheel and provide a surface for the brake pads to grip onto. Together, the calipers and rotors work in tandem to provide effective braking power and control.

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  • 24. 

    The low air warning device must activate before air pressure drops to?

    • 621 kPa ( 90 psi )

    • 518 kPa ( 75 psi )

    • 380 kPa ( 55 psi )

    • 311 kPa ( 45 psi )

    Correct Answer
    A. 380 kPa ( 55 psi )
    Explanation
    The low air warning device is designed to activate before the air pressure drops to a dangerously low level. In this case, the correct answer is 380 kPa (55 psi), which is the lowest pressure among the given options. This means that the warning device should activate when the air pressure reaches this threshold, ensuring that the driver is alerted to the low air pressure before it drops even further.

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  • 25. 

    Anti-lock braking systems (ABS) use warning indicator lights to indicate?

    • The system temperature

    • Malfunctions of the system

    • Wheel skidding

    • None of the above

    Correct Answer
    A. Malfunctions of the system
    Explanation
    Anti-lock braking systems (ABS) use warning indicator lights to indicate malfunctions of the system. These indicator lights are designed to alert the driver when there is a problem with the ABS, such as a sensor failure or a malfunction in the hydraulic system. By illuminating the warning light, the ABS system is able to communicate to the driver that there is an issue that needs to be addressed. This allows the driver to take appropriate action, such as seeking repairs or maintenance, to ensure the ABS is functioning properly and their vehicle is safe to drive.

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  • 26. 

    When a vehicle's brakes do not comply with the Ontario Highway Traffic Act and regulations?

    • Only the driver may be charged

    • Only the vehicle operator may be charged

    • The driver will not be charged

    • Both the vehicle operator and the driver may be charged

    Correct Answer
    A. Both the vehicle operator and the driver may be charged
    Explanation
    When a vehicle's brakes do not comply with the Ontario Highway Traffic Act and regulations, both the vehicle operator and the driver may be charged. This means that both the person operating the vehicle and the person driving the vehicle can be held responsible for the non-compliance of the brakes. The responsibility is shared between these two individuals, and they may face charges accordingly.

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  • 27. 

    A brake having an exposed push rod is out of adjustment when?

    • The push rod stoke exceeds the adjustment limit of the brake chamber

    • The angle between the slack adjuster and push rod is less than 90 degrees

    • The angle between the slack adjuster and push rod is more than 90 degrees

    • Air pressure drops more than 55 kPa (8 psi when brakes are applied

    Correct Answer
    A. The push rod stoke exceeds the adjustment limit of the brake chamber
    Explanation
    When the push rod stroke exceeds the adjustment limit of the brake chamber, it means that the push rod has extended too far and is not properly adjusted. This can lead to ineffective braking and potentially cause safety issues. It is important to ensure that the push rod is adjusted within the specified limits to maintain proper brake function.

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  • 28. 

    When conducting an inspection of the air brake system, the vehicle should be parked securely on a?

    • Hill with the wheels turned toward the curd

    • Level surface and in any location

    • Hill with the wheels turned away from the curb

    • Level surface and in a safe location

    Correct Answer
    A. Level surface and in a safe location
    Explanation
    When conducting an inspection of the air brake system, it is important to park the vehicle securely on a level surface and in a safe location. This ensures that the vehicle is stable and not at risk of rolling or causing any accidents during the inspection. Parking on a level surface allows for accurate assessment of the air brake system, as any abnormalities or issues can be easily detected. Additionally, parking in a safe location ensures the safety of the inspector and other individuals nearby, minimizing any potential hazards that may arise during the inspection process.

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  • 29. 

    A governor controls air compressor?

    • Temperature

    • Speed and pressure

    • Cut-in and Cut-out pressures

    • Temperature and speed

    Correct Answer
    A. Cut-in and Cut-out pressures
    Explanation
    Cut-in and cut-out pressures refer to the pressure levels at which an air compressor starts and stops operating. The governor is responsible for controlling these pressure levels. When the pressure drops below the cut-in pressure, the governor activates the compressor to start, and when the pressure reaches the cut-out pressure, the governor stops the compressor. Therefore, the governor plays a crucial role in controlling the operation of the air compressor based on the cut-in and cut-out pressures.

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  • 30. 
    When measuring the applied push rod stroke on brakes having push rods, air pressure must be between? - ProProfs

    When measuring the applied push rod stroke on brakes having push rods, air pressure must be between?

    • 690 and 828 kPa (100 and 120 psi)

    • 621 and 690 kPa (90 and 100 psi)

    • 690 and 932 kPa (100 and 135 psi)

    • 414 and 828 kPa (60 and 120 psi)

    Correct Answer
    A. 621 and 690 kPa (90 and 100 psi)
    Explanation
    The correct answer is 621 and 690 kPa (90 and 100 psi). This range of air pressure is necessary when measuring the applied push rod stroke on brakes with push rods. It ensures that the measurement is accurate and within the appropriate range for the brake system. Air pressure that is too high or too low could result in inaccurate measurements or potential damage to the brake system.

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  • 31. 
    Repair and re-adjustment of all types air brakes may be performed by? - ProProfs

    Repair and re-adjustment of all types air brakes may be performed by?

    • Licensed drivers

    • Certified drivers

    • Certified technicians

    • Drivers wwith a valid air brake endorsement

    Correct Answer
    A. Certified technicians
    Explanation
    Certified technicians are qualified and trained professionals who have the necessary knowledge and skills to repair and re-adjust all types of air brakes. They have undergone specific training and have obtained certification to ensure they can perform these tasks safely and effectively. Licensed drivers and drivers with a valid air brake endorsement may have some knowledge about air brakes, but they may not have the expertise or training required to perform complex repairs and re-adjustments. Therefore, certified technicians are the most suitable individuals to carry out these tasks.

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  • 32. 
    When inspecting visible air brake hoes and tubes, the driver must check for: - ProProfs

    When inspecting visible air brake hoes and tubes, the driver must check for:

    • Audible air leak

    • Damaged or worn air line

    • Improper fitting used to connect or repair an air line

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The driver must check for all of the above when inspecting visible air brake hoses and tubes. This includes checking for any audible air leaks, looking for any damaged or worn air lines, and ensuring that there are no improper fittings used to connect or repair an air line. It is important to check for all of these issues to ensure that the air brake system is functioning properly and safely.

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  • 33. 

    Air compressor cut-in pressure must never be less than?

    • 414 kPa (60 psi)

    • 828 kPa (120 psi)

    • 552 kPa (80 psi)

    • 932 kPa (135 psi)

    Correct Answer
    A. 552 kPa (80 psi)
    Explanation
    The cut-in pressure of an air compressor refers to the minimum pressure at which the compressor starts running to build up pressure. It is important for the cut-in pressure to be set at an appropriate level to ensure the efficient operation of the compressor. In this case, the correct answer is 552 kPa (80 psi). This means that the compressor should start running when the pressure drops to 552 kPa or below. Setting the cut-in pressure too low could result in the compressor constantly starting and stopping, leading to inefficiency and unnecessary wear and tear on the equipment.

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  • 34. 

    The air loss rate on a towing vehicle with two or more trailers must not exceed?

    • 28 kPa (4 psi) per minute

    • 41 kPa (6 psi) per minute

    • 55 kPa (8 psi) per minute

    • 7 kPa (1 psi) per minute

    Correct Answer
    A. 41 kPa (6 psi) per minute
    Explanation
    The correct answer is 41 kPa (6 psi) per minute. This is the maximum allowable air loss rate for a towing vehicle with two or more trailers. It is important to maintain proper air pressure in the braking system to ensure safe and effective braking. If the air loss rate exceeds this limit, it could indicate a problem with the braking system that needs to be addressed.

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  • 35. 

    When inspecting the air tanks, the driver must look for?

    • Loose air compressor governor

    • Improperly spliced air line

    • Insecurely mounted air tank

    • None of the above

    Correct Answer
    A. Insecurely mounted air tank
    Explanation
    The driver must inspect the air tanks for any signs of insecure mounting. This means checking if the air tanks are properly secured and not loose or unstable. This is important to ensure the safety and stability of the vehicle's air system. A loose or insecurely mounted air tank can lead to air leaks or other malfunctions, which can affect the braking system and overall vehicle performance. Therefore, it is crucial for the driver to look for this issue during the inspection.

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  • 36. 

    The air loss rate on a single vehicle ( bus, tractor or truck ) must not exceed?

    • 21 kPa ( 3 psi ) per minute

    • 41 kPa ( 6 psi ) per minute

    • 55 kPa ( 8 psi ) per minute

    • 7 kPa ( 1 psi ) per minute

    Correct Answer
    A. 21 kPa ( 3 psi ) per minute
    Explanation
    The air loss rate on a single vehicle (bus, tractor, or truck) must not exceed 21 kPa (3 psi) per minute. This means that the vehicle should not lose more than 21 kPa or 3 psi of air pressure in its system within a minute. This requirement is important for maintaining the proper functioning of the vehicle's braking system, as the air pressure is crucial for effective braking. Exceeding this limit could lead to compromised braking performance and potential safety hazards.

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  • 37. 

    An air tank drain valve that fails to function?

    • Is a normal condition of the air brake system

    • Is a defect of the air brake system

    • Indicates a defective air compressor governor

    • Indicates a defective brake pedal

    Correct Answer
    A. Is a defect of the air brake system
    Explanation
    The correct answer is "Is a defect of the air brake system." If an air tank drain valve fails to function, it indicates a defect in the air brake system. The drain valve is an essential component that helps remove moisture and contaminants from the air tanks. If it fails to function, it can lead to a buildup of moisture and contaminants, which can affect the performance and efficiency of the air brake system. Therefore, it is important to address this issue and fix the defect in order to maintain the proper functioning of the air brake system.

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  • 38. 

    A tractor protection valve is defective if the trailer supply valve is closed ( pulled out ) and air exhausts from the?

    • Trailer service line with the brake pedal pressed

    • Trailer supply line with the brake pedal pressed

    • Trailer service line with the brake pedal released

    • Trailer supply line with the brake pedal released

    Correct Answer
    A. Trailer service line with the brake pedal pressed
    Explanation
    If the tractor protection valve is defective, it means that it is not functioning properly. In this case, when the trailer supply valve is closed (pulled out), air will exhaust from the trailer service line when the brake pedal is pressed. This indicates a problem with the valve as it should not be allowing air to escape from the service line in this situation.

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  • 39. 

    Hydraulic systems use brake?

    • A. Steam

    • B. Compressed air

    • C. Water

    • D. Brake fluid

    Correct Answer
    A. D. Brake fluid
    Explanation
    Hydraulic systems use brake fluid because it has the necessary properties to function effectively in the system. Brake fluid is a type of hydraulic fluid that is specifically designed to withstand high temperatures and pressures. It has a high boiling point, low compressibility, and excellent lubrication properties. These characteristics make it ideal for transmitting force and energy within the hydraulic system, allowing the brakes to operate efficiently and effectively.

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  • 40. 

    The air loss rate on a single vehicle (Bus, Tractor or Truck) must not exceed?

    • 21 kPa (3 psi ) per minute

    • 41 kPa (6 psi ) per minute

    • 55 kPa (8 psi ) per minute

    • 7 kPa ( 1 psi ) per minute

    Correct Answer
    A. 21 kPa (3 psi ) per minute
    Explanation
    The air loss rate on a single vehicle (Bus, Tractor or Truck) must not exceed 21 kPa (3 psi) per minute. This means that the vehicle should not lose more than 21 kPa (3 psi) of air pressure in the air system in one minute. This is important because maintaining proper air pressure is crucial for the safe operation of the vehicle's braking system. If the air loss rate exceeds this limit, it could lead to brake failure and compromise the safety of the vehicle.

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  • 41. 

    A vehicle should only be driven when air pressure is in the normal operating range. A drop in air pressure below the cut-in setting is a sign that the air brake system is malfunctioning?

    • True

    • False

    Correct Answer
    A. True
    Explanation
    If a vehicle's air pressure drops below the cut-in setting, it indicates a malfunction in the air brake system. This is because the cut-in setting is the minimum air pressure required for the system to operate effectively. Therefore, it is important to only drive a vehicle when the air pressure is within the normal operating range to ensure the proper functioning of the air brake system.

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  • 42. 

    Disc brake components include?

    • Rotors and Brake drums

    • Camshafts and Brake Calipers

    • Camshafts and Brake shoes

    • Calipers and Rotors

    Correct Answer
    A. Calipers and Rotors
    Explanation
    The correct answer is Calipers and Rotors. Calipers are responsible for applying pressure to the brake pads, which in turn press against the rotors to create friction and slow down the vehicle. Rotors, also known as brake discs, are attached to the wheels and provide a surface for the brake pads to grip onto. Together, the calipers and rotors form the key components of a disc brake system, allowing for effective braking and control of the vehicle.

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  • 43. 

    When inspecting visible air brake hoses and tubes, the driver check for?

    • Audile air leak

    • Damaged or worn air line

    • Improper fitting used to connect or repair an air line

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    When inspecting visible air brake hoses and tubes, the driver checks for audile air leaks, damaged or worn air lines, and improper fittings used to connect or repair an air line. This is because all of these issues can affect the proper functioning of the air brake system and compromise the safety of the vehicle. Therefore, the driver should inspect for all of these potential problems during the inspection process.

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  • 44. 

    When air loss from an air brake system exceeds the prescribed limits?

    • The vehicle must be driven slowly on the highway

    • The vehicle may not be driven on any road or highway

    • The vehicle must be driven to the nearest service centre

    • The vehicle must be driven only on secondary roads

    Correct Answer
    A. The vehicle may not be driven on any road or highway
    Explanation
    When air loss from an air brake system exceeds the prescribed limits, it is not safe to drive the vehicle on any road or highway. This is because the air brake system is essential for the safe operation of the vehicle, and if there is excessive air loss, the brakes may not function properly, putting the driver, passengers, and other road users at risk. Therefore, it is necessary to address the issue and have the vehicle repaired before it can be driven again.

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  • 45. 

    The air loss rate on a towing vehicle with two or more trailers must not exceed?

    • 28 kPa ( 4 psi ) per minute

    • 41 kPa ( 6 psi ) per minute

    • 55 kPa ( 8 psi ) per minute

    • 7 kPa ( 1 psi ) per minute

    Correct Answer
    A. 41 kPa ( 6 psi ) per minute
    Explanation
    The correct answer is 41 kPa (6 psi) per minute. When towing a vehicle with two or more trailers, it is important to ensure that the air loss rate does not exceed this limit. This is crucial for maintaining proper braking and stability while on the road. If the air loss rate exceeds this limit, it could lead to a loss of control and potentially dangerous situations. Therefore, it is essential to regularly check and maintain the air pressure in the towing vehicle's braking system to ensure it stays within the recommended limits.

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  • 46. 

    A tractor protection valve is defective if the trailer supply valve is closed ( pulled out ) and air exhausts from the?

    • Trailer service line with the brake pedal pressed

    • Trailer supply line with the brake pedal pressed

    • Trailer service line with the brake pedal released

    • Trailer supply line with the brake pedal released

    Correct Answer
    A. Trailer service line with the brake pedal pressed
    Explanation
    If the tractor protection valve is defective, it means that it is not functioning properly. In this scenario, when the trailer supply valve is closed (pulled out), air should not be able to exhaust from the trailer service line with the brake pedal pressed. However, if the tractor protection valve is defective, air will still exhaust from the trailer service line even when the brake pedal is pressed. Therefore, the correct answer is "Trailer service line with the brake pedal pressed."

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  • 47. 

    Brake fade can result from?

    • High brake temperatures

    • High air compressor temperature

    • High air brake system pressure

    • Driving at high altitudes

    Correct Answer
    A. High brake temperatures
    Explanation
    Brake fade occurs when the brakes become overheated, causing a decrease in braking effectiveness. High brake temperatures can lead to this condition, as the excessive heat can cause the brake pads and rotors to lose their frictional properties. This can occur during prolonged or heavy braking, such as when driving downhill or towing heavy loads. The heat generated during braking can also cause brake fluid to boil, further reducing braking performance. Therefore, high brake temperatures are a common cause of brake fade.

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  • 48. 
    Repair and re-adjustment of all types of air brakes may be performed by? - ProProfs

    Repair and re-adjustment of all types of air brakes may be performed by?

    • Licensed drivers

    • Certified drivers

    • Certified technician

    • Drivers with a valid air brake endorsement

    Correct Answer
    A. Certified technician
    Explanation
    The repair and re-adjustment of all types of air brakes should be performed by a certified technician. This ensures that the individual has the necessary knowledge and expertise to safely and effectively handle the complex systems involved in air brakes. Licensed drivers and drivers with a valid air brake endorsement may have some understanding of air brakes, but they may not have the comprehensive training and skills required to perform repairs and adjustments. Certified technicians have undergone specific training and have the necessary certifications to handle these tasks.

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  • 49. 

    The brake systems on  most large commerical vehicles use?

    • Compressed air to apply the brakes

    • Steam to apply the brakes

    • Water to apply the brakes

    • Brake fluid to apply the brakes

    Correct Answer
    A. Compressed air to apply the brakes
    Explanation
    Most large commercial vehicles use compressed air to apply the brakes. This is known as an air brake system. In this system, air is stored in a tank and when the brake pedal is pressed, the air is released to activate the brake mechanism. Compressed air is used because it can provide a consistent and reliable force to apply the brakes, especially for heavy vehicles that require a higher braking force. Steam and water are not commonly used in brake systems, and while brake fluid is used in some vehicles, it is not the primary choice for large commercial vehicles.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 18, 2013
    Quiz Created by
    Victorpal
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