#1
Which of the following is a recommended step for safely driving combination vehicles?
Accelerate quickly to merge with traffic
Use the parking brake to stop quickly
Leave plenty of space when stopping behind other vehicles
Drive close to the vehicle in front to maintain speed
#2
What is the purpose of the tractor protection valve?
To control the tractor's speed
To apply pressure to the trailer brakes
To prevent air from leaving the tractor's air tanks
To adjust the trailer suspension
#3
When should you use the trailer hand valve?
To test the trailer brakes
During normal driving
Only in emergencies
To adjust the trailer suspension
#4
What is the purpose of the glad hands on a combination vehicle?
To connect the trailer's air brake lines to the tractor
To adjust the trailer's suspension
To secure cargo in the trailer
To control the tractor's air brakes
#5
What is the purpose of the trailer hand valve?
To apply pressure to the service brakes
To provide air to the trailer brakes
To control the tractor protection valve
To release the tractor brakes
#6
What is the recommended action if your trailer begins to skid?
Apply the brakes lightly
Release the brakes completely
Steer in the opposite direction of the skid
Accelerate to regain control
#7
When backing up a combination vehicle, what should you do?
Use only the side mirrors
Rely solely on the backup camera
Have someone guide you if possible
Trust the sensors to detect obstacles
#8
What is the primary purpose of the emergency air line?
To supply air to the service brakes
To supply air to the trailer brakes
To supply air to the steering system
To supply air to the suspension
#9
What is the primary reason for conducting a tug test before coupling a trailer?
To ensure the trailer is properly aligned
To test the brakes of the trailer
To check for air leaks in the trailer
To confirm the trailer is securely attached to the tractor
#10
What is the appropriate action to take if your trailer begins to swing out while turning?
Accelerate to straighten out the trailer
Brake hard to stop the trailer from swinging
Steer in the direction of the trailer's swing
Turn the steering wheel in the opposite direction of the swing
#11
What does it mean when a trailer jackknifes?
The trailer tires lose traction
The trailer forms a V-shape with the tractor
The trailer brakes fail
The trailer's lights malfunction
#12
When should you check the amount of air in the air tanks of a combination vehicle?
Before starting your trip
Only during breaks
After completing your trip
Every six months
#13
Why is it important to distribute weight evenly in a combination vehicle?
To reduce fuel consumption
To ensure proper handling and stability
To decrease tire wear
To increase braking efficiency
#14
What is the function of the fifth wheel on a combination vehicle?
To provide additional traction
To control the trailer's air brakes
To connect the trailer to the tractor
To adjust the trailer's suspension
#15
What is the primary function of the tractor protection valve?
To supply air to the tractor's suspension
To control the trailer's air brakes
To prevent the tractor from losing air pressure
To protect the tractor's air brake system from air loss
#16
In the event of a sudden stop, what could happen if there is too much weight on the trailer's rear?
The tractor will tip forward
The trailer will jackknife
The trailer may push the tractor
The trailer's brakes will fail