Test 2 Flashcards
What will happen if you are driving a combo vehicle and the service line gets disconnected?
you may not notice anything until the brakes are applied - it may activate the trailer emergency brakes
Why should you connect glad hands even if they are dummy lines?
it keeps water and dirt out of the lines
What gear should the tractor engine be in after your uncouple the trailer and are inspecting the trailer supports?
Neutral
The following is the best way to detect a jackknifed trailer in the early stages:
when you can see it in the mirrors
Where should the tractor be when you inspect the landing gear after uncoupling the trailer?
with the tractor frame under the trailer
The following will happen if you cross the trailer air lines
you can drive it away if there is no spring brake
After connecting the trailer brake lines, you can verify they are working properly by
applying and release the trailer brakes and listen for them engaging and disengaging
To prevent rollover, cargo should be
spread evenly across the trailer(s) and as low as possible
After coupling with a trailer, the supports should be:
the crank handle should be secured and the feet fully raised
When testing the trailer air brakes, what is the proper position for the trailer protection valve?
normal
The maximum air leakage rate per minute with the engine and brakes off should be no more than
3 psi
A fully loaded trailer is ______ to roll over in a accident
ten times more likely
What is the best procedure for stopping a skid?
let off the brakes
What is the purpose of the trailer air supply control?
it controls the air for the trailer brakes and can activate the emergency brakes
To unlock the fifth wheel, pull the release handle to the _____ position
open
After coupling a tractor and trailer and connecting the brake lines you should
supply air to the trailer brakes and remove the air supply to lock the brakes
You should use chocks when parking a trailer without spring brakes because
if the air supply leaks away, there will be no brakes
What is a tractor jackknife?
when you lock up the drive tires on the tractor and the tractor spins our sideways as the trailer continues to push forward
Why should you be sure that the fifth wheel plate is greased as required?
to prevent steering problems
An antilock braking system (ABS) is useful
whether it is on the tractor or the trailers
