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UPSC Civil Service Exam Questions - Engineering

Q1:

A cold drawn seamless steel tubing subject to internal pressure, has a diameter of 6 cm and wall thickness of 0.2 cm. The ultimate strength of steel is 3600 kg/cm2. The bursting pressure (in kg/cm2) is

A 120

B 240

C 480

D 960

ANS:B - 240

Since the thickness(0.2 cm) is less than 1/20of Dia ie; 1/20*0.6.Hence this problem comes under thin cylinders which can be solved by the formula.

Design of thin cylinders Pd/2t=permissible tensile strength.

Put the values and p=bursting pressure=240kg/cm2.