CDL Combination Vehicles Practice Test Results

Question 1
49% answer correctly
Rearward amplification array(the "crack-the-whip" effect) is greater in combinations where there are __________ and __________ trailers.
More, shorter
Fewer, shorter
Fewer, longer
More, longer
Question 2
92% answer correctly
On a combination vehicle what color is the emergency air line?
White
Red
Black
Yellow
Question 3
90% answer correctly
How would a driver supply air to trailer air tanks?
Activate the service line
Push in the trailer air supply valve
Activate the air generator
Pull out the trailer air supply valve