CDL Doubles and Triples Practice Test Results

Question 1
77% answer correctly
How should the shut off valves be set on a double trailer?
Rear of back trailer open, rear of front trailer closed
Rear of front trailer open, rear of back trailer closed
Rear of front trailer closed, rear of back trailer closed
Rear of front trailer open, rear of back trailer open
Question 2
90% answer correctly
You`re going down a long grade. What`s the best way to prevent your brakes from overheating?
Use engine braking and ride the brakes down the grade
Make sure you`re in the proper gear and use trailer brakes only
Make sure you`re in the proper gear, use engine braking and apply the brakes firmly when necessary
Supplement the air brakes by using the spring brakes
Question 3
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 first trailer and close the shut off valves of the second trailer
Open 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