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
Nothing
You`ll see the emergency valve open and release air
You`ll hear air escaping from the open valve
Question 2
35% answer correctly
Which of the following statements about rearward amplification is not true?
Another name for rearward amplification is the crack-the-whip effect
The longer the trailers you`re pulling the larger the effect
The rearmost trailer is the most affected
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?
Varies depending on the load
1/2 inch
1 inch
None