CDL Combination Vehicles Practice Test Results

Question 1
90% answer correctly
How would a driver supply air to trailer air tanks?
Activate the air generator
Push in the trailer air supply valve
Pull out the trailer air supply valve
Activate the service line
Question 2
92% answer correctly
On a combination vehicle what color is the emergency air line?
Black
Yellow
White
Red
Question 3
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
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