Control & OperationCâu 81 / 120
What happens if you turn too sharply while backing a tractor-trailer?
a.The trailer brakes lock automatically
b.The steering axle lifts off the ground
c.The trailer can jackknife against the tractor and damage both units
d.The fifth wheel unlocks
Giải thích
Excessive angle between tractor and trailer during backing folds the units together and can crush the cab, fenders, or air lines. Trailer brakes do not lock on their own, the steer axle stays down, and the fifth wheel does not unlock from a sharp angle.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
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- You need to pull into a truck stop space at night and only a blind-side space is open. What is the safest practice?
- Why should you check the trailer height and the position of the fifth wheel jaws visually after coupling, even after a successful tug test?
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