Nc Cdl Combination Vehicles Exam Questions Answered Correctly!!

The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that: {Ans: The coupling is not right and should be fixed before driving the coupled unit.}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? {Ans: Nothing is likely to happen until you try to apply the brakes.}After you have coupled the trailer you should have to raise the landing gear by using: {Ans: Low gear.}After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position? {Ans: Normal.}To unlock the fifth wheel, pull the release handle to the _____ position. {Ans: Open.}Before you back under a trailer, make sure the: {Ans: Trailer brakes are locked.}Describe what the service line is for? {Ans: To carry air to a relay valve that allows the trailer brakes to be applied quickly.}Which of these vehicles off-track the most. {Ans: 5-axle tractor towing a 52-foot trailer.}Which type of truck-trailer combination has the best chance of the "crack the whip" rollover? {Ans: A tractor pulling 3