3/8/25, 3:40 PM
LOUISIANA CLASS D "CHAUFFEUR'S" LICENSE EXAM 2025
(AIR BRAKE SYSTEMS ) WITH 100% CORRECT ANSWERS
1. What is the function of the automatic air tank drain in an air brake system?
To increase air pressure
To expel water and oil automatically
To control brake fluid levels
To monitor brake temperature
2. When one vehicle is towing another, the connection between these vehicles
must not be longer than
20 feet
25 feet
18 feet
15 feet
3. In a scenario where a large vehicle is approaching a sudden obstacle, which
emergency braking method would be more effective, and why?
Both methods are equally effective in all situations.
Stab braking would be more effective because it allows for
maximum braking force to be applied quickly, helping to stop the
vehicle more rapidly.
Controlled braking would be more effective as it prevents skidding
and maintains control.
Stab braking should not be used in large vehicles due to the risk of
1/47
,3/8/25, 3:40 PM
losing control.
2/47
,3/8/25, 3:40 PM
4. Describe the significance of the maximum width regulation for buses in
relation to air brake systems.
The maximum width regulation allows for more passenger space
without considering safety.
The maximum width regulation ensures that buses can safely
operate on roads and utilize air brake systems effectively without
compromising stability.
The maximum width regulation is irrelevant to air brake systems and
only pertains to aesthetics.
The maximum width regulation is primarily for fuel efficiency and does
not affect safety.
5. If a trailer hauling logs is operating at night, what regulations would apply
regarding its maximum dimensions?
The maximum height, length, and width requirements would apply.
It would be exempt from all size regulations.
It would only need to comply with height regulations.
It would be allowed to exceed all size regulations.
6. Despite lawful exceptions, the maximum legal length for a single vehicle is :
60 feet
40 feet
30 feet
50 feet
7. During the day, if your vehicle is carrying a load that extends more than four
feet beyond the rear of your vehicle, you should:
Attach a red lamp to the side of the load
3/47
, 3/8/25, 3:40 PM
Attach a red flag to the rearmost point of the load
Attach a yellow flag to the rearmost point of the load
Attach two white reflectors to the sides of the load
8. If a vehicle's parking brake valve closes at 15 psi instead of the required 20-40
psi, what potential issues could arise during operation?
Improved fuel efficiency
Inadequate braking performance
Increased cargo capacity
Enhanced vehicle speed
9. What is the second step in checking the air brakes according to the provided
information?
inspect the brake pads for wear
test the emergency brake system
make sure the low air pressure warning signals are working
check the brake fluid levels
10. If a school bus is operating in a residential area with children frequently
getting on and off, what speed limit should the driver adhere to?
15mph
45mph
35mph
25mph
4/47
LOUISIANA CLASS D "CHAUFFEUR'S" LICENSE EXAM 2025
(AIR BRAKE SYSTEMS ) WITH 100% CORRECT ANSWERS
1. What is the function of the automatic air tank drain in an air brake system?
To increase air pressure
To expel water and oil automatically
To control brake fluid levels
To monitor brake temperature
2. When one vehicle is towing another, the connection between these vehicles
must not be longer than
20 feet
25 feet
18 feet
15 feet
3. In a scenario where a large vehicle is approaching a sudden obstacle, which
emergency braking method would be more effective, and why?
Both methods are equally effective in all situations.
Stab braking would be more effective because it allows for
maximum braking force to be applied quickly, helping to stop the
vehicle more rapidly.
Controlled braking would be more effective as it prevents skidding
and maintains control.
Stab braking should not be used in large vehicles due to the risk of
1/47
,3/8/25, 3:40 PM
losing control.
2/47
,3/8/25, 3:40 PM
4. Describe the significance of the maximum width regulation for buses in
relation to air brake systems.
The maximum width regulation allows for more passenger space
without considering safety.
The maximum width regulation ensures that buses can safely
operate on roads and utilize air brake systems effectively without
compromising stability.
The maximum width regulation is irrelevant to air brake systems and
only pertains to aesthetics.
The maximum width regulation is primarily for fuel efficiency and does
not affect safety.
5. If a trailer hauling logs is operating at night, what regulations would apply
regarding its maximum dimensions?
The maximum height, length, and width requirements would apply.
It would be exempt from all size regulations.
It would only need to comply with height regulations.
It would be allowed to exceed all size regulations.
6. Despite lawful exceptions, the maximum legal length for a single vehicle is :
60 feet
40 feet
30 feet
50 feet
7. During the day, if your vehicle is carrying a load that extends more than four
feet beyond the rear of your vehicle, you should:
Attach a red lamp to the side of the load
3/47
, 3/8/25, 3:40 PM
Attach a red flag to the rearmost point of the load
Attach a yellow flag to the rearmost point of the load
Attach two white reflectors to the sides of the load
8. If a vehicle's parking brake valve closes at 15 psi instead of the required 20-40
psi, what potential issues could arise during operation?
Improved fuel efficiency
Inadequate braking performance
Increased cargo capacity
Enhanced vehicle speed
9. What is the second step in checking the air brakes according to the provided
information?
inspect the brake pads for wear
test the emergency brake system
make sure the low air pressure warning signals are working
check the brake fluid levels
10. If a school bus is operating in a residential area with children frequently
getting on and off, what speed limit should the driver adhere to?
15mph
45mph
35mph
25mph
4/47
