General Contractor Practice Exam

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When is a hub used in surveying?

Raising the transit level
Trimming to a close tolerance
Marking boundaries
Calculating distances

The correct answer is: Trimming to a close tolerance

A hub is used in surveying primarily as a reference point for establishing control over the positioning of instruments and layout of measurements. When a surveyor is trimming to a close tolerance, they are focusing on precision and ensuring that their measurements meet specific standards. The hub serves as a stable, defined point around which careful measurements can be taken, allowing for adjustments and ensuring that the construction or layout aligns accurately with design specifications. In this context, while a hub can have applications in other areas of surveying, such as marking boundaries or assisting in calculations, its crucial role is most evident when precision is needed in aligning physical structures or performing close tolerance work. Each of the other functions, such as raising a transit level or calculating distances, may involve different tools or methods that do not rely as heavily on the hub's stability and precision in the same way.