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.
Base
Neck
Top
Shank
Question 3
85% answer correctly
Why is it important to ensure that the fifth wheel is properly greased?
To ensure good hose connections
To prevent steering problems
To ensure good electrical connections
To ensure a secure connection to the trailer