Exam Details
| Subject | Strength of Materials | |
| Paper | ||
| Exam / Course | B.Tech. Civil (Construction Management) / (Water Resources Engineering)/ (Aero Space Engineering) BTCM-BTWRE | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
Describe Hooke's law in the context of mild steel.
Two parallel walls are stayed together by a steel rod of 5 em diameter passing through metal plates and nuts at both ends. The nuts are tightened when the rod is at 150°C, to keep the walls 10 m apart. Determine the stresses in the rod when the temperature falls down to 50°C if
the ends do not yield, and
the ends yield by 1 cm.
Take Young's modulus and coefficient of thermal expansion of the rod material as 2 x 10^5 N/mm^2 and 12 x 10^-60 respectively.
What do you understand by 'Poisson's ratio' Explain briefly.
In separate experiments, Young's modulus and Rigidity modulus of a material have been determined as 120 GPa and 50 GPa respectively. Calculate the Poisson's ratio and Bulk modulus of the material.
What is meant by the term 'Principal stress' Discuss briefly.
The state of stress at a critical point of a strained solid is given by cr= 70
cry kN/mm^2 and 'txy =45 kN/mm^2. If the strengths of the solid in tension, compression and shear are 120 90 kN/mm^2 and 75 kN/mm^2 respectively, verify the safety of the strained solid.
Draw neat sketches of different types of supports and show various possible reactions in each type of support for a plane beam structure.
Draw the shear force and bending moment diagrams for an overhanging beam shown in Figure l.
<img src='./qimages/12249-4b.jpg'>
Distances AD, DE, EB and BC are 2 2 2 m and 4 m respectively. 10
What is the relationship between shear force and bending moment in flexure Explain briefly.
A timber beam, 150 mm wide and 300 mm deep; is simply supported over a span of 4 m. Find the maximum uniformly distributed load that the beam can carry, if the stress is not to exceed 8 N/mm^2. The UDL is to be applied over full length of the beam.
What is meant by 'Section Modulus' of a beam Explain with the help of an expression.
An I-section, shown in Figure is subjected to a bending moment of 2·5 kNm at its neutral axis. Find the maximum stress developed in the beam section.
<img src='./qimages/12249-6b.jpg'>
Show a pattern of shear stress distribution in a rectangular beam section.
Find the torque which a shaft of 250 mm diameter can safely transmit, if the shear is not to exceed 460 N/mm^2.
8. Write short notes on any two of the following:
Euler's critical load for a column
Stiffness of springs connected in series and parallel
Composite section
Two parallel walls are stayed together by a steel rod of 5 em diameter passing through metal plates and nuts at both ends. The nuts are tightened when the rod is at 150°C, to keep the walls 10 m apart. Determine the stresses in the rod when the temperature falls down to 50°C if
the ends do not yield, and
the ends yield by 1 cm.
Take Young's modulus and coefficient of thermal expansion of the rod material as 2 x 10^5 N/mm^2 and 12 x 10^-60 respectively.
What do you understand by 'Poisson's ratio' Explain briefly.
In separate experiments, Young's modulus and Rigidity modulus of a material have been determined as 120 GPa and 50 GPa respectively. Calculate the Poisson's ratio and Bulk modulus of the material.
What is meant by the term 'Principal stress' Discuss briefly.
The state of stress at a critical point of a strained solid is given by cr= 70
cry kN/mm^2 and 'txy =45 kN/mm^2. If the strengths of the solid in tension, compression and shear are 120 90 kN/mm^2 and 75 kN/mm^2 respectively, verify the safety of the strained solid.
Draw neat sketches of different types of supports and show various possible reactions in each type of support for a plane beam structure.
Draw the shear force and bending moment diagrams for an overhanging beam shown in Figure l.
<img src='./qimages/12249-4b.jpg'>
Distances AD, DE, EB and BC are 2 2 2 m and 4 m respectively. 10
What is the relationship between shear force and bending moment in flexure Explain briefly.
A timber beam, 150 mm wide and 300 mm deep; is simply supported over a span of 4 m. Find the maximum uniformly distributed load that the beam can carry, if the stress is not to exceed 8 N/mm^2. The UDL is to be applied over full length of the beam.
What is meant by 'Section Modulus' of a beam Explain with the help of an expression.
An I-section, shown in Figure is subjected to a bending moment of 2·5 kNm at its neutral axis. Find the maximum stress developed in the beam section.
<img src='./qimages/12249-6b.jpg'>
Show a pattern of shear stress distribution in a rectangular beam section.
Find the torque which a shaft of 250 mm diameter can safely transmit, if the shear is not to exceed 460 N/mm^2.
8. Write short notes on any two of the following:
Euler's critical load for a column
Stiffness of springs connected in series and parallel
Composite section
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