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 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 the second trailer and close the shut off valves of the first 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?
You`ll see the emergency valve open and release air
Nothing
You`ll hear air escaping from the open valve
You`ll see the brakes on the last trailer engage
Question 3
39% answer correctly
You`re driving a 80 ft. double trailer at 45 mph. If the pavement is dry and weather is good how many seconds of following distance should you maintain?
10
9
8
45