MSW Sheet Metal Work: Mensuration, Marking, Riveting & Cylinder/Cone Fabrication: 20 flashcards
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1. What is the formula for the curved surface area (CSA) of a cylinder?
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CSA $= 2\pi rh$
2. What is the total surface area (TSA) of a closed cylinder?
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TSA $= 2\pi r(h+r)$
3. How do you find the slant height $l$ of a cone if you know $r$ and $h$?
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$l = \sqrt{r^2 + h^2}$
4. What is the curved surface area of a cone?
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$\pi r l$
5. What is the total surface area of a cone?
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$\pi r(l + r)$
6. What is the volume of a cone?
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$\frac{1}{3}\pi r^2 h$
7. What is the ratio of the volume of a cone to the volume of a cylinder with the same base radius and height?
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1:3 (cone is one-third)
8. How do you calculate the volume of metal in a hollow cylindrical pipe?
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$\pi(R^2 - r^2)h$, where $R$ is outer radius and $r$ is inner radius.
9. What is the formula for the weight of a sheet-metal job?
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Weight $=$ surface area $\times$ thickness $\times$ density
10. What is the sector angle $\theta$ for the pattern of a cone?
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$\theta = 360 \times \frac{r}{l}$
11. What is the purpose of a center punch?
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To create a small indentation (0.5–1 mm deep) that prevents the drill bit from slipping.
12. Which tool is used to mark any angle such as 45°, 60°, or 120°?
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Vernier bevel protractor
13. What is the recommended rivet diameter in relation to sheet thickness?
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1.5 to 2 times the sheet thickness
14. How is rivet length calculated?
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Rivet length $=$ total sheet thickness $+ 1.5 \times$ rivet diameter
15. What is the minimum distance between rivet holes?
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$2.5 \times$ rivet diameter
16. Which rivet head gives a smooth flush surface?
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Countersunk rivet
17. Why is chalk powder or Prussian blue applied to sheet metal before marking?
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To make scriber marks visible on the reflective surface.
18. What is the minimum bend radius for sheet metal?
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$2 \times$ sheet thickness
19. Which joining method is best for GI sheet cylinder seams?
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Welding
20. Which solder is used for copper and brass seams?
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Soft solder (tin-lead)
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