Questions appearing on this CDL practice test:
When should you use the hand valve to park a combination vehicle?
Which answer is correct for the air valves when testing the trailer service brakes only?
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
How should you test the tractor trailer connection for security?
Which answer is correct for the air valves when testing the trailer spring / parking brakes only?
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
You supply air to the trailer tanks by:
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):
You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
The fifth wheel locking lever is not locked after the jaws close around the kingpin; this means:
When backing your tractor under a trailer, you should expect:
Before you start to uncouple, you must
During uncoupling, you should disconnect the electrical cable and
As part of your vehicle inspection test, if your vehicle is equipped with air brakes and has a trailer, you will inspect the air connections between the truck or tractor and the trailer. Make sure that the ________ are locked in place and free of damage or air leaks.
If your vehicle gets stuck on a railroad track, you should
If your test of the tractor protection valve is successful,
You should not use the trailer hand brake to straighten out a jackknifing trailer, because
You should not use the trailer hand valve while driving because
A trailer is most likely to jackknife when it is
When backing a tractor under a trailer, you should
