GATE (CE) : STRENGTH OF MATERIAL #9

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Question 1

A thin walled cylindrical pressure vessel having a radius of 0.5 m and wall thickness of 25 mm is subjected to an internal pressure of 700 kPa. The hoop stress developed is

• A14 MPa
• B1.4 MPa
• C0.14 MPa
• D0.014 MPa

Question 2

The possible location of shear centre of the channel section, shown below, is

• AP
• BQ
• CR
• DS

Question 3

A thick cylinder of internal diameter 10 cm is subjected to an internal pressure of 50 N/mm², then the thickness of the cylinder according to the maximum shear stress theory, if yield stress is 270 N/mm² and factor of safety is 2, is _______mm.

• A98.2
• B50
• C48.2
• D148.2

Question 4

A water mains 140 cm inner diameter contains water at a pressure head of 200 m. The minimum thickness of the metal shell required for the water mains, given that maximum permissible stress in the metal is 400 kg/cm², will be ___ mm.

• A35
• B3.5
• C0.35
• D350

Question 5

A thin gas cylinder with an internal radius of 100 mm is subject to an internal pressure of 10 MPa. The maximum permissible working stress is restricted to 100 MPa. The minimum cylinder wall thickness (in mm) for safe design must be

• A10
• B20
• C30
• D75

Question 6

The shell of a boiler is 2 m in diameter and the plates are 2 cm thick. By how much % the working pressure will be reduced if the efficiency of the joint is 80% as compared to 100% efficiency
[Assume safe working stress for the shell plates as 70 MPa]

• A10
• B15
• C20
• D25

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