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ISRO ME 2019 STRENGTH OF MATERIALS 4
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Question 1
The ratio of the core of a rectangular section to the area of the rectangular section when as a short column is
Question 2
In a bi-axial stress problem, the stresses in x and y directions are and The maximum principal stress in MPa is
Question 3
Compare the ratio of volumetric increase in cylindrical and spherical shell when they are subjected to same internal pressure and both have same d/t ratio, where d is the internal diameter of the vessel and t is the thickness of the vessel. It is given that poisson ratio is 0.3. Neglect the stress in radial direction.
Question 4
Two bars each of length L and of the same material are subjected to the same axial tensile force P. The first bar has a uniform diameter 2d. The second bar has a diameter d for length l and a diameter 2d for the remaining length. The ratio of the strain energies of the two bars U1/U2 is _________.
Question 5
The ratio of elongation of a conical and rectangular bar of same length under its own weight is __________.
Question 6
A two meter length of steel shafting is to transmit 130 kW at 3600 RPM through a flexible coupling from a motor to pump. Assuming maximum shear stress as 40 MPa, the required diameter (in mm) of shaft is __________.
Question 7
A thin strip of copper (E = 120 GPa) having length L and thickness, t = 1 mm is bent into a circle and held with the ends just touching. The maximum bending stress in the strip is limited to 250 MPa. The length of the strip is
Question 8
A copper bar of 25 cm length is fixed by means of supports at its ends. Supports can yield (total) by 0.01 cm. If the temperature of the bar is raised by 100 °C, then the stress induced in the bar for if αc = 20×10-6/°C and Ec = 0.5×105 MPa will be
Question 9
Which material has highest value of poission’s ratio?
Question 10
For a simply supported beam of length ‘l’ subjected to downward load of uniform intensity w, match List-I with List –II and selected the correct answer using the codes given below the lists:
List-I
A- Slope of shear force diagram
B- Maximum shear force
C- Maximum deflection
D- Magnitude of maximum bending moment
List-II
1-
2- W
3-
4-
List-I
A- Slope of shear force diagram
B- Maximum shear force
C- Maximum deflection
D- Magnitude of maximum bending moment
List-II
1-
2- W
3-
4-
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