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?
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 the second trailer and close the shut off valves of the first trailer
Close the shut off valves of both trailers
Open the shut off valves of both trailers
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 hear air escaping from the open valve
You`ll see the brakes on the last trailer engage
Question 3
35% answer correctly
Which of the following statements about rearward amplification is not true?
The longer the trailers you`re pulling the larger the effect
The more trailers you`re pulling the larger the effect
The rearmost trailer is the most affected
Another name for rearward amplification is the crack-the-whip effect