CDL Combination Vehicles Practice Test Results

Question 1
75% answer correctly
After connecting to a trailer, how can you ensure that the connection is secure?
Lock the trailer brakes and pull forward slowly then inspect the connection
Release the trailer brakes and pull forward slowly then inspect the connection
Lock the trailer brakes and pull backward slowly then inspect the connection
Pull forward quickly to stress the connection
Question 2
56% answer correctly
The emergency air line:
Supplies air to the trailer air tanks
Provides a backup route from the air compressor to the air tanks
Supplies air to the footbrake or trailer handbrake
Carries air controlled by the footbrake or trailer handbrake
Question 3
87% answer correctly
In which of the following circumstances should the valve hand be used to park a combination vehicle?
When unloading
When parked on a grade
Never
When parking for less than 10 minutes