CDL - Combination
Glad hands are used to connect the? - Answer- Service and emergency air lines
from the tractor to the trailer
Why should you be sure the fifth wheel plate is greased as required? - Answer- To
prevent steering problems
After connecting the air lines, but before backing under the trailer, you should? -
Answer- Supply air to the trailer system, then pull out the supply knob
A tractor trailer vehicle combination is most likely to roll over in a turn when the
configuration includes? - Answer- triple 28 foot trailers
The trailer air supply control valve should automatically close when the air pressure
falls to between what PSI? - Answer- 20 and 45
When coupling the proper position of the fifth wheel is? - Answer- Tilted down
towards the end of the tractor
Which part of the king pin should the locking jaws close around? - Answer- The
shank
When checking that the trailer is securely coupled to the tractor the landing gear
should be? - Answer- Slightly Raised
A trailer is most likely to jack knife when it is? - Answer- Empty
The spring don't release when you push the trailer air supply control valve you
should? - Answer- Check the air line connections
Loss of air pressure in the emergency lines causes? - Answer- The trailer
emergency brakes to come on
When you get ready to back under a semi[trailer, you should line up? - Answer-
Directly in front of the trailer
The best way to tell if your trailer has started to skid is to? - Answer- See it in your
mirrors
Why should you lock the tractor glad hands to each other or to the dummy couplers
when you are not towing a trailer? - Answer- It will keep dirt and water out of the air
lines
To unlock the fifth wheel, pull the release handle to the what position? - Answer-
Open
Glad hands are used to connect the? - Answer- Service and emergency air lines
from the tractor to the trailer
Why should you be sure the fifth wheel plate is greased as required? - Answer- To
prevent steering problems
After connecting the air lines, but before backing under the trailer, you should? -
Answer- Supply air to the trailer system, then pull out the supply knob
A tractor trailer vehicle combination is most likely to roll over in a turn when the
configuration includes? - Answer- triple 28 foot trailers
The trailer air supply control valve should automatically close when the air pressure
falls to between what PSI? - Answer- 20 and 45
When coupling the proper position of the fifth wheel is? - Answer- Tilted down
towards the end of the tractor
Which part of the king pin should the locking jaws close around? - Answer- The
shank
When checking that the trailer is securely coupled to the tractor the landing gear
should be? - Answer- Slightly Raised
A trailer is most likely to jack knife when it is? - Answer- Empty
The spring don't release when you push the trailer air supply control valve you
should? - Answer- Check the air line connections
Loss of air pressure in the emergency lines causes? - Answer- The trailer
emergency brakes to come on
When you get ready to back under a semi[trailer, you should line up? - Answer-
Directly in front of the trailer
The best way to tell if your trailer has started to skid is to? - Answer- See it in your
mirrors
Why should you lock the tractor glad hands to each other or to the dummy couplers
when you are not towing a trailer? - Answer- It will keep dirt and water out of the air
lines
To unlock the fifth wheel, pull the release handle to the what position? - Answer-
Open
