Difficulty: Easy
Correct Answer: True
Explanation:
Design proportion
Standard empirical proportions for an unprotected cast-iron flange coupling include: hub diameter ≈ 2d, hub length ≈ 1.5d, outside flange diameter ≈ 4d, and flange thickness t ≈ 0.5d.
Note
Exact dimensions are refined by stress checks (keys, bolts, hub), but 0.5d is a widely used starting proportion.
Final Answer
True
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