Free CDL Quiz

What is the lower fifth wheel?

a.The kingpin on the trailer
b.The plate and locking mechanism mounted on the tractor frame that receives the kingpin
c.The trailer apron plate
d.The landing gear base plate

Explanation

The lower fifth wheel is the V-shaped plate and locking mechanism mounted on the tractor frame. It receives the kingpin from the trailer and locks it in place. It must be properly greased and inspected for cracks and secure mounting.

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Related Questions

What is the upper fifth wheel?What is the release handle on a fifth wheel used for?What is the trailer apron?Why is the fifth wheel greased?When backing under the trailer during coupling, what speed should you use?

About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the CDL Combination Test #2 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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