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

What is the purpose of the 'kingpin' on a semi-trailer?

To connect the electrical system to the tractor To lock the trailer doors To slide the trailer axles back and forth To engage with the fifth wheel locks on the tractor to secure the vehicle combination

Correct Answer:

To engage with the fifth wheel locks on the tractor to secure the vehicle combination

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