Practice question

What is the 'tug test' performed immediately after coupling a tractor to a semi-trailer?

  1. Pulling the steering wheel back and forth vigorously
  2. Gently attempting to pull forward in low gear against the locked trailer brakes to verify mechanical engagement of the fifth wheel locking jaws
  3. Having five people pull on the rear trailer bumper
  4. Pulling the windshield wipers by hand

Answer: B — Gently attempting to pull forward in low gear against the locked trailer brakes to verify mechanical engagement of the fifth wheel locking jaws

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