Practice question

Which statement is correct about high coupling and lock-verification faults?

High coupling occurs when the kingpin is on top of closed jaws rather than locked inside; no gap, locked release handle, visual jaw check, and tug test must all confirm the coupling.
Trust the tug test even with a visible gap
Ignore it if the tractor starts normally
Use the trailer hand valve as the main solution

Answer: A — High coupling occurs when the kingpin is on top of closed jaws rather than locked inside; no gap, locked release handle, visual jaw check, and tug test must all confirm the coupling.

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