Vehicle Inspection第 10 / 120 题
While checking the tractor's fifth wheel during your walkaround, what condition tells you the coupling is unsafe?
a.The locking jaws are closed around the shank of the kingpin
b.There is a light coat of grease on the fifth wheel plate
c.There is visible space between the upper and lower fifth wheel plates
d.The release handle is in the locked position
解析
Any gap between the upper and lower fifth wheel plates means the trailer is not fully seated and the coupling can fail. Jaws closed around the kingpin shank, grease on the plate, and a locked release handle are all signs of a proper coupling.
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