Practice question

What precaution should be taken when uncoupling on any grade?

Uncouple quickly to minimize time
Avoid uncoupling on grades whenever possible; if necessary, use wheel chocks in addition to parking brakes
Release the parking brakes before uncoupling
Have someone hold the trailer by hand

Answer: B — Avoid uncoupling on grades whenever possible; if necessary, use wheel chocks in addition to parking brakes

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