Which part of the kingpin should the locking jaw close around?
Answer: C
The shank.
While inspecting the 5th wheel coupling while connecting the trailer the locking jaws should be closed around the shank of the kingpin.
All choices
- AThe base.
- BThe head.
- CThe shank.
Why the other answers are wrong
A. The base.
Choice A is wrong because the locking jaw should close around the shank, not the base of the kingpin.
B. The head.
Choice B is wrong because the locking jaw does not close around the head but around the shank of the kingpin.
CDL Combination Vehicles Test Info
Questions on Exam
20
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
The Combination Vehicles test content is federally standardized, so this question applies in every state. Age limits, fees, and testing procedures do vary — check your state's CDL requirements.
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More CDL Combination Vehicles Practice Questions
- After you have coupled the trailer you should raise the landing gear by first using:
- After you lock the kingpin into the fifth wheel, you should check the connection by:
- Why should you be sure that the fifth wheel plate is greased as required?
- The combination of which two things will greatly reduce the likelihood of a rollover?
- You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You expect the trailer brakes to come on and: