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XD03.13 Industrial Rigging And Signaling Practice Exam

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With a four-part line block and tackle using bronze brushed, sheaves and wire rope, a load of 7250 lbs requires approximately how many pounds of line?
Correct Answer:
2210 lbs
Explanation:
The concept being tested is how a four-part tackle changes the pull needed from the line in a practical rigging setup. A four-part tackle provides an ideal mechanical advantage of four, meaning, in a frictionless world, you’d need about 7250 / 4 = 1812.5 lb of pull. In the real world, friction in the bronze-brushed sheaves and with wire rope reduces this efficiency. With this combination, an overall efficiency around 0.83 is a reasonable estimate. So the actual pull becomes 7250 / (4 × 0.83) ≈ 7250 / 3.32 ≈ 2180–2190 lb, which is closest to 2210 lb. Therefore, about 2210 pounds of line is required.

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