CDL Doubles and Triples Practice Test Results

Question 1
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?
9
10
8
45
Question 2
77% answer correctly
How should the shut off valves be set on a double trailer?
Rear of front trailer open, rear of back trailer closed
Rear of front trailer open, rear of back trailer open
Rear of back trailer open, rear of front trailer closed
Rear of front trailer closed, rear of back trailer closed
Question 3
94% answer correctly
When inspecting the converter dolly coupling to the rear trailer, how much space should there be between the upper and lower fifth wheel?
1/2 inch
None
Varies depending on the load
1 inch