CDL Combination Vehicles Practice Test Results

Question 1
82% answer correctly
Before backing under a trailer that you`ve just hooked to your tractor you should:
Hook up the service and emergency lines
Ground the trailer
Make sure the fifth wheel has been removed
Hook up the electrical lines
Question 2
75% answer correctly
The locking jaws should close around the __________ of the kingpin.
Neck
Top
Shank
Base
Question 3
85% answer correctly
Why is it important to ensure that the fifth wheel is properly greased?
To ensure a secure connection to the trailer
To ensure good electrical connections
To ensure good hose connections
To prevent steering problems