CDL Combination & Air brake Test Questions With Verified Answers.
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Course
CDL
Institution
CDL
CDL Combination & Air brake Test
Questions With Verified Answers.
Tractor Protection Values - answer-It keeps air in the tractor in the event the trailer air leaks
- It is controlled by the trailer air supply valve in the cab
-It will close automatically if air pressure is low
If one of the gl...
In order to supply air to the trailer, you must first... - answer✔Push in the tractor protection valve
The earliest way to notice a trailer skid is... - answer✔By seeing it in your mirrors
Before you begin coupling.... - answer✔Check your path for Hazards
You should crank the landing gear until... - answer✔It is as far up as it will go
When coupling the trailer, back up slowly until... - answer✔The fifth wheel just touches the
trailer
The trailer should be lowered so that... - answer✔it's raised slightly when the tractor's backed
under it
In order to inspect the coupling you should... - answer✔use a Flashlight
A kingpin is.... - answer✔A pin which locks the trailer to the tractor on the fifth wheel
The trailer air supply control... - answer✔Is a red, 8 sided knob
The fifth wheel should be checked to see if... - answer✔There is any damage or missing parts
It is properly greased
The jaws are open
You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the
right height when: - answer✔It will be raised slightly when the tractor is backed under it.
You should not back a tractor under a trailer until the whole air system is: - answer✔At normal
pressure
Which part of the kingpin should the locking jaws close around? - answer✔The shank
You supply air to the trailer tanks by: - answer✔Pushing in the trailer air supply valve.
There are two things that a driver can do to prevent a roll over. They are: (1) Keep the cargo as
close to the ground as possible; and (2): - answer✔Go slow around turns
When you get ready to back under the semi trailer you should line up: - answer✔Directly in front
of the trailer.
When should you use the hand valve to park a combination vehicle? - answer✔Never
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