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 electrical lines
Ground the trailer
Hook up the service and emergency lines
Make sure the fifth wheel has been removed
Question 2
75% answer correctly
The locking jaws should close around the __________ of the kingpin.
Base
Top
Neck
Shank
Question 3
89% answer correctly
When is the proper time to use the trailer handbrake to straighten out a trailer that`s jackknifing?
As soon as you start to jackknife
When you start to recover from the jackknife
In the middle of the jackknife
Never