AZ ROC R-22 House Moving Practice Questions - Arizona ROC R-22 House Moving Examination Exam

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When elevating a 120-ton two-story wood-frame building, why is a unified hydraulic jacking system with a single central manifold preferred over independently controlled hand jacks?

It allows proportional fluid distribution to maintain a level lift plane and prevent structural racking or twisting. It increases the maximum lifting speed by eliminating internal fluid friction in individual cylinders. It reduces the total force required to lift the building by multiplying hydraulic pressure at each jack. It allows operators to use jacks of different stroke lengths without requiring safety shutoff valves.

Correct Answer:

It allows proportional fluid distribution to maintain a level lift plane and prevent structural racking or twisting.

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