CDL Doubles and Triples Practice Test Results

Question 1
74% answer correctly
What is required before you supply air to the air tanks of the second trailer?
Close the shut off valves of both trailers
Open the shut off valves of the second trailer and close the shut off valves of the first trailer
Open the shut off valves of both trailers
Open the shut off valves of the first trailer and close the shut off valves of the second trailer
Question 2
78% answer correctly
Suppose that you test the brakes on a trailer by opening the service line valve at the rear of the last trailer. Which of the following will happen?
Nothing
You`ll see the emergency valve open and release air
You`ll see the brakes on the last trailer engage
You`ll hear air escaping from the open valve
Question 3
41% answer correctly
How do you test air supply to the rear trailer?
Open the service line shut off on the rear trailer
Open the emergency line shut off on the rear trailer
Use a calibrated air pressure gauge
Pull forward slowly then apply the brakes and watch for a drop in air tank psi