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UPSC Civil Service Exam Questions - Engineering

Q1:

A vane 20 cm long and 10 cm in diameter was pressed into a soft marine clay at the bottom of a bore hole. Torque was applied gradually and failure occurred at 1000 kg cm. The cohesion of the clay in kg/cm2 is :

A

B

C

D

ANS:A -

S = T/π [ (D²H)/2 + (D³/6)].
S = 1000/π [ (10²x20)/2 + (10³)/6].
S = (1/π)x(6/7).

Option A is Right.