Calculate circumferential prestress of a cylindrical prestressed concr – McqOptions

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1.	Calculate circumferential prestress of a cylindrical prestressed concrete water tank given that the thickness is 12mm, loss ratio is 0.75, the maximum stress under working pressure is 1n/mm2(Nd value is 720)?
A.	9.4n/mm<sup>2</sup>
B.	5.6n/mm<sup>2</sup>
C.	11.2n/mm<sup>2</sup>
D.	15.2n/mm<sup>2</sup>
Answer» B. 5.6n/mm<sup>2</sup>

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