CDL Doubles and Triples Practice Test Results

Question 1
44% answer correctly
What is a converter dolly used for?
To convert an axle into an additional fifth wheel
To convert a fifth wheel into an additional axle
To couple an axle and a fifth wheel
To convert a fifth wheel into a dolly
Question 2
74% answer correctly
What is required before you supply air to the air tanks of the second trailer?
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
Close the shut off valves of both trailers
Question 3
65% answer correctly
When making a lane change, check your mirrors:
All of these are correct
After completing the lane change
Before signaling the lane change
When starting the lane change