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