CDL COMBINATION VEHICLE EXAM LATEST UPDATE
CDL COMBINATION VEHICLE EXAM LATEST UPDATE You should not back a tractor under a trailer until the whole air system is: - CORRECT ANSWER At normal pressure You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when: - CORRECT ANSWER It will be raised slightly when the tractor is backed under it. Which part of the kingpin should the locking jaws close around? - CORRECT ANSWER The shank When you get ready to back under the semi trailer you should line up: - CORRECT ANSWER Directly in front of the trailer. How should you test the tractor semi trailer connection for security? - CORRECT ANSWER 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 ANSWER Never You supply air to the trailer tanks by: - CORRECT ANSWER Pushing in the trailer air supply valve.
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