SGI Class 1 Practice Questions - Saskatchewan Class 1 Commercial Driver Licence Written Exam

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During the coupling procedure, why must you back the tractor slowly toward the trailer until the fifth wheel just touches the trailer apron?

To avoid damage to the tractor bumper To check that the height is correct and prevent the tractor fifth wheel from passing under the kingpin To ensure the trailer's parking brakes do not release To prevent the air lines from getting tangled

Correct Answer:

To check that the height is correct and prevent the tractor fifth wheel from passing under the kingpin

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