Construction Coordinator Practice Exam

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Prepare for the Construction Coordinator Test with our comprehensive quiz. Utilize flashcards and multiple choice questions, complete with explanations. Boost your confidence and pass your exam!

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When using a fluid-assisted boring machine, why is drilling fluid added when pulling the drill string back through the hole?

To lubricate the drill bit for smoother cutting
To help the rotating back-reamer expand the drilled pilot hole diameter and reduce drag on the conduit being pulled into place
To cool down the machinery during operation
To prevent soil collapse in the hole

The correct answer is: To help the rotating back-reamer expand the drilled pilot hole diameter and reduce drag on the conduit being pulled into place

Drilling fluid is added when pulling the drill string back through the hole primarily to assist the rotating back-reamer in expanding the drilled pilot hole diameter. This process helps reduce drag on the conduit being pulled into place. The drilling fluid creates a lubricated environment around the back-reamer and the conduit, ensuring that when it expands the hole, the material can flow more freely and with less resistance. This is crucial for maintaining the efficiency and effectiveness of the pulling operation. Furthermore, introducing fluid during this phase also helps in managing any potential soil displacement and support within the borehole, which is particularly important to maintain the integrity of the drilled pathway. The reduced friction helps in preventing any potential sticking or binding of the equipment, facilitating a smoother operation overall. This function is essential for ensuring that the conduit is installed correctly and with minimal obstacles.