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
All of these are true
Saves wear on the dummy coupler
Question 2
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 3
89% answer correctly
How much space should exist between the lower and upper fifth wheel plates?
Approx. 1/2 inch
Approx. 1/4 inch
None
Approx. 1 inch