For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?
Correct answer: C. Decreases upwards
- A. Remains same throughout
- B. Increases upwards
- C. Decreases upwards
- D. May decrease or increase upwards depending upon whether vacuum or positive pressure
- E. would be maintained inside the shell
Explanation
The lower shell courses carry greater hydrostatic liquid pressure, so they require greater thickness. Consequently, shell-course thickness generally decreases toward the top, provided the upper course still meets the minimum diameter requirement.
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