CDL Combination Vehicles Practice Test Results

Question 1
90% answer correctly
How would a driver supply air to trailer air tanks?
Push in the trailer air supply valve
Activate the air generator
Activate the service line
Pull out the trailer air supply valve
Question 2
92% answer correctly
On a combination vehicle what color is the emergency air line?
Yellow
Red
White
Black
Question 3
75% answer correctly
The locking jaws should close around the __________ of the kingpin.
Shank
Neck
Base
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