CDL Combination Vehicles Practice Test Results

Question 1
90% answer correctly
How would a driver supply air to trailer air tanks?
Push in the trailer air supply valve
Activate the service line
Pull out the trailer air supply valve
Activate the air generator
Question 2
92% answer correctly
On a combination vehicle what color is the emergency air line?
Black
Red
Yellow
White
Question 3
53% answer correctly
What function does the service line perform?
Distributes air throughout the cab and to each of the trailers
Marks the maximum refill point for air tanks
Supplies air to the footbrake and trailer handbrake
Carries air controlled by the footbrake or trailer handbrake