Final answer:
Shade 5 is the most effective for eye protection when using an oxygen acetylene cutting torch.
Explanation:
When operating an oxygen acetylene cutting torch on a construction site, the most effective shade for eye protection would be Shade 5. This level of shading provides the right balance of protection without making the work area too dark to see clearly.
Shades such as Shade 8, Shade 10, and Shade 12 are darker and typically used for more intense welding processes where higher levels of protection are required against the bright arc light.
For torch cutting, where the light intensity is not as high as welding, Shade 5 is recommended to ensure adequate eye protection while allowing good visibility.
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