CDL Doubles and Triples Practice Test Results

Question 1
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 brakes on the last trailer engage
You`ll see the emergency valve open and release air
You`ll hear air escaping from the open valve
Nothing
Question 2
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 rearmost trailer is the most affected
Another name for rearward amplification is the crack-the-whip effect
The more trailers you`re pulling the larger the effect
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?
None
Varies depending on the load
1/2 inch
1 inch