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UPSC Civil Service Exam Questions - Engineering

Q1:

If the load, warping and frictional stresses in a cement concrete slab are 210 N/mm2, 290 N/mm2 and 10 N/mm2 respectively, the critical combination of stresses during summer midday is

A 290 N/mm2

B 390 N/mm2

C 490 N/mm2

D 590 N/mm2

ANS:C - 490 N/mm2

cc=ls+ws-fs -- summer.
cc = ls+ws+fs-- winter.
210+290-10.
490n/mm2.