CDL Combination Vehicles Practice Test Results

Question 1
73% answer correctly
Why is it a good idea to lock the glad hands together when not pulling a trailer?
Keeps water and dirt out of the lines
Maintains air tank pressure by keeping air from escaping
Saves wear on the dummy coupler
All of these are true
Question 2
75% answer correctly
After connecting to a trailer, how can you ensure that the connection is secure?
Pull forward quickly to stress 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
Lock the trailer brakes and pull forward slowly then inspect the connection
Question 3
90% answer correctly
How would a driver supply air to trailer air tanks?
Activate the service line
Push in the trailer air supply valve
Pull out the trailer air supply valve
Activate the air generator