Cdl Combination (With complete solution)

You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when: correct answers It will be raised slightly when the tractor is backed under it. You should not back a tractor under a trailer until the whole air system is: correct answers normal pressure Which part of the kingpin should the locking jaws close around? correct answers shank When you get ready to back under the semi trailer you should line up: correct answers Directly in front of the trailer How should you test the tractor semi trailer connection for security correct answers Pull gently forward in low gear against the locked trailer brakes, then look at it carefully. When should you use the hand valve to park a combination vehicle correct answers never You supply air to the trailer tanks by: correct answers Pushing in the trailer air supply valve. Why should you be sure that the fifth wheel plate is greased as required? correct answers To prevent steering problems After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by: correct answers Applying and releasing the trailer brakes and listening for brake sounds There are two things that a driver can do to prevent a rollover. There are: (1) keep the cargo as close to the ground as possible; and (2) correct answers Go slow around turns Before you back under a trailer, make sure the: correct answers Trailer brakes are locked If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away? correct answers Nothing is likely to happen until you try to apply the brakes