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
Lock the trailer brakes and pull backward slowly then inspect the connection
Pull forward quickly to stress the connection
Release the trailer brakes and pull forward slowly then inspect the connection
Question 2
56% answer correctly
The emergency air line:
Supplies air to the trailer air tanks
Carries air controlled by the footbrake or trailer handbrake
Provides a backup route from the air compressor to the air tanks
Supplies air to the footbrake or trailer handbrake
Question 3
75% answer correctly
You`re hooking a tractor to a trailer. After connecting the air lines and before backing under the trailer you should:
Be sure not to activate air supply to the trailerarray(s) to prevent damage to the air delivery system
Activate air supply to the trailerarray(s) then lock the trailer brakes
Activate air supply to the trailerarray(s) and leave the trailer brakes unlocked
Pull forward to test the strength of the air line connection