#1
Which of the following is a recommended step for safely driving combination vehicles?
Leave plenty of space when stopping behind other vehicles
ExplanationMaintains safe stopping distance to avoid collisions.
#2
What is the purpose of the tractor protection valve?
To prevent air from leaving the tractor's air tanks
ExplanationMaintains air pressure integrity in the tractor system.
#3
When should you use the trailer hand valve?
Only in emergencies
ExplanationReserved for critical braking situations.
#4
What is the purpose of the glad hands on a combination vehicle?
To connect the trailer's air brake lines to the tractor
ExplanationLinks the trailer's braking system to the tractor.
#5
What is the purpose of the trailer hand valve?
To provide air to the trailer brakes
ExplanationControls the air flow to the trailer brakes for braking.
#6
What is the recommended action if your trailer begins to skid?
Steer in the opposite direction of the skid
ExplanationHelps regain control by aligning the vehicle with its path.
#7
When backing up a combination vehicle, what should you do?
Have someone guide you if possible
ExplanationProvides assistance to ensure safe maneuvering.
#8
What is the primary purpose of the emergency air line?
To supply air to the trailer brakes
ExplanationOffers emergency braking capability for trailers.
#9
What is the primary reason for conducting a tug test before coupling a trailer?
To confirm the trailer is securely attached to the tractor
ExplanationEnsures safe connection prior to travel.
#10
What is the appropriate action to take if your trailer begins to swing out while turning?
Steer in the direction of the trailer's swing
ExplanationCounteracts the trailer's momentum for control.
#11
What does it mean when a trailer jackknifes?
The trailer forms a V-shape with the tractor
ExplanationTrailer swings outward, forming a dangerous V-shape.
#12
When should you check the amount of air in the air tanks of a combination vehicle?
Before starting your trip
ExplanationEnsures proper brake functionality from the start.
#13
Why is it important to distribute weight evenly in a combination vehicle?
To ensure proper handling and stability
ExplanationPrevents imbalance leading to loss of control.
#14
What is the function of the fifth wheel on a combination vehicle?
To connect the trailer to the tractor
ExplanationProvides pivotal connection for towing.
#15
What is the primary function of the tractor protection valve?
To protect the tractor's air brake system from air loss
ExplanationSafeguards the tractor's brake functionality.
#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
ExplanationImbalance causes forward weight transfer.