1.
When the ______ closes, it stops any air from going out of the tractor.
alcohol evaporator
|
|
hand valve
|
|
height control valve
|
|
tractor protection valve
|
2.
Which of the following is NOT part of inspecting the coupling?
Checking that the locking lever is in the "lock" position
|
|
Checking for enough clearance between the rear of the tractor frame and the landing gear.
|
|
Making sure the fifth-wheel jaws have closed around the shank of the kingpin.
|
|
Making sure there is no space between the upper and the lower fifth-wheel
|
3.
When backing a trailer on a curved path you should back towards:
either side.
|
|
the driver's side.
|
|
the passenger's side.
|
|
neither side (back up straight).
|
4.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
You may not notice a major leak in the service line until you try to put the brakes on.
|
|
The air could leak out of the trailer air tank, releasing its emergency brakes.
|
|
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
|
|
None of the above.
|
5.
Cargo tie-downs are used to:
keep cargo from shifting or falling.
|
|
prevent skidding.
|
|
prevent right-turn accidents.
|
|
prevent freezing.
|
6.
Which of the following is NOT part of testing the trailer service brakes?
Checking for normal air pressure.
|
|
Pushing in the trailer air supply knob.
|
|
Releasing the parking brakes.
|
|
Moving the vehicle forward slowly.
|
7.
If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
To prevent water and dirt from getting into the coupler and the air lines.
|
|
To prevent freezing of the washer liquid.
|
|
Because if you don't, you will never build system pressure.
|
|
To prevent overheating.
|
8.
Before entering a curve, you should:
maintain your speed.
|
|
come to a complete stop.
|
|
increase your speed.
|
|
reduce your speed.
|
9.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep the vents clear so they work correctly.
|
|
keep an eye on your tires.
|
|
go slowly around turns.
|
|
make sure that the release arm is in the engaged position.
|
10.
If you let air out of hot tires:
air pressure will increases, causing the tires to blow out.
|
|
as the tire cools, the air pressure will be too low.
|
|
the tires will cool off much sooner.
|
|
None of the above.
|
Next page
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More
Rate This Free Test