Calculate minimum wall thickness given a cylindrical prestressed water – McqOptions

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1.	Calculate minimum wall thickness given a cylindrical prestressed water tank of internal diameter 30m over a depth of 7.5m and the permissible compressive stress at transfer is 13n/mm² and the maximum compressive stress under working pressure is 1n/mm² and the loss ratio is 0.75?
A.	43.8
B.	82.3
C.	64.5
D.	90.4
Answer» C. 64.5

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