Questions appearing on this CDL practice test:
The best way to tell if your trailer has started to skid is to
Describe what the trailer air supply control does.
If your vehicle is equipped with dummy couplers, why should you connect the glad hands to them?
When coupling a tractor-semitrailer, to test the trailer air brakes, you should place the tractor protection valve control in what position?
Trucks roll over more easily when fully loaded and are
To stop a trailer skid, you should
After you supply air to the trailer, make sure the airlines are not crossed and the trailer brakes are working. This is done by:
The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than ____ PSI per minute.
If the service airline comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away?
You are coupling a tractor and semi-trailer and have connected the air lines. Before backing under the trailer, you should:
You have coupled with a semi-trailer. In what position should you put the front trailer supports before driving away?
The driver crosses the airlines when hooking up to an old trailer. What will happen?
Why should you be sure that the fifth wheel plate is greased as required?
To prevent rollover, cargo should be
Where should the tractor be when you inspect the landing gear after uncoupling the trailer?
An antilock braking system (ABS) is useful
You should use chocks when parking a trailer without spring brakes because
To unlock the fifth wheel, pull the release handle to the _______ position.
What is a tractor jackknife?
What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?