#1
Which of the following is a primary reason for conducting a pre-trip inspection of a combination vehicle?
To check for potential safety hazards or defects
ExplanationPrevents accidents by ensuring vehicle safety.
#2
What should you do if you detect a leak during your pre-trip inspection?
Fix it as soon as possible
ExplanationPrevents further damage and ensures safety.
#3
What is the purpose of the kingpin in a combination vehicle?
To secure the trailer to the fifth wheel
ExplanationEnsures proper connection between tractor and trailer.
#4
What is the recommended way to test the trailer emergency brakes during a pre-trip inspection?
By pulling the hand valve or using the brake pedal
ExplanationEnsures functionality of emergency brakes.
#5
What is the role of the fifth wheel in a combination vehicle?
To connect the tractor to the trailer
ExplanationPrimary coupling mechanism between tractor and trailer.
#6
What should you do if you notice your trailer drifting to one side while driving?
Check the weight distribution
ExplanationCorrects imbalance to maintain control.
#7
What is the purpose of the trailer air supply knob in a combination vehicle?
To control the trailer brakes
ExplanationRegulates air pressure for trailer braking.
#8
When driving a combination vehicle, which technique should you use when turning?
Use your mirrors to monitor traffic behind you
ExplanationEnsures awareness of surrounding vehicles.
#9
What is the purpose of the trailer hand valve?
To control the trailer's emergency brakes
ExplanationProvides emergency braking capability.
#10
What should you do if you experience trailer swing during a turn?
Release the accelerator and steer gently in the opposite direction of the swing
ExplanationCorrective action to regain control.
#11
Why is it important to distribute weight evenly in a combination vehicle?
To prevent axle overloading and ensure stability
ExplanationEnsures safe handling and prevents accidents.
#12
When should you use the trailer hand valve in combination with the foot brake?
To stop quickly in an emergency
ExplanationEnhances emergency braking capability.
#13
Why is it important to avoid sharp turns when driving a combination vehicle?
To maintain control and stability
ExplanationReduces risk of rollovers and loss of control.
#14
When should you inspect the air brakes on a combination vehicle?
Before each trip
ExplanationEnsures brake functionality and safety.
#15
When should you use the trailer hand valve?
To slow down without using the service brakes
ExplanationAlternative braking method for control.
#16
What is the purpose of the glad hands on a combination vehicle?
To connect the electrical system of the tractor to the trailer
ExplanationFacilitates electrical connection between tractor and trailer.
#17
What is the purpose of the trailer height adjustment valve?
To adjust the trailer's height during loading
ExplanationFacilitates proper loading and clearance.
#18
Why should you ensure proper weight distribution when loading a combination vehicle?
To prevent axle overloading and ensure stability
ExplanationPrevents accidents and ensures safe handling.
#19
What is the primary function of the trailer height control valve?
To adjust the trailer's height during loading
ExplanationFacilitates proper loading and clearance.