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UPSC Civil Service Exam Questions - Engineering

Q1:

A short column of external diameter D1 and internal diameter D2 carries an external load W. For no-tension condition, the eccentricity will be :

A (D12 - D22)/8D2

B (D21 - D22)/8D2

C (D12 - D22)/8D1

D (D1 - D2)2 /8D1

ANS:C - (D12 - D22)/8D1

Answer should be (D1^2+D2^2)/8D1.