______________ closure is the weakest enclosure for cylindrical vessels?
Correct answer: C. Conical or flat plate
- A. Hemispherical
- B. Torispherical
- C. Conical or flat plate
- D. Elliptical
Explanation
A flat plate or conical closure has poorer pressure strength than hemispherical, elliptical, or properly proportioned torispherical heads. It therefore needs substantially greater thickness and is regarded as the weakest closure type.
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