Strength of Materials: How to Make Your Structures Stronger
There are many factors that go into making a structure strong and stable. In this blog post, we will discuss some of the most important principles of strength of materials. By understanding these concepts, you can make your structures stronger and less likely to fail. We will cover topics such as stress and strain, Young's modulus, and more!
The strength of materials is the study of how different materials respond to various types of forces. This includes both internal forces, like those created by tension or compression, and external forces, like wind or gravity. By understanding the strength of materials principles, engineers can design buildings, bridges, and other structures that are safe and stable
One of the most important concepts in the strength of materials is stress. Stress is the force per unit area that a material can withstand before it breaks. There are three types of stress:
- Tensile stress, which pulls a material apart
- Compressive stress, which squeezes a material
- Shear stress, which cuts a material
All materials have a certain amount of strength, which is the force required to cause them to break. The strength of a material depends on its composition, structure, and manufacturing process. For example, metals are typically stronger than plastics.
When a material is subjected to a force, it experiences stress. If the stress is too high, the material will break. To prevent this from happening, engineers must design structures that can withstand the forces they will experience. One way to do this is to use calculations based on strength of materials principles. These calculations take into account the type of material being used, its strength, and the amount of force that will be applied to it. By using these calculations, engineers can design structures that are strong enough to support the loads they will experience.
The strength of materials is a critical field of engineering that allows us to create safe, stable structures. By understanding the principles of stress and strength, we can design buildings, bridges, and other structures that can withstand the forces they will experience.
Following are some of the multiple choice questions on the Strength of Materials with answers that will help the students in developing their knowledge.
Strength of Materials MCQ
1. The algebraic sum of moments of the forces forming couple about any point in their plane is
2. A composite shaft consisting of two stepped portions having spring constants k1 and k2 is held between two rigid supports at the ends. Its equivalent spring constant is
3. If a number of forces act simultaneously on a particle, it is possible
4. The object of caulking in a riveted joint is to make the joint
5. Limiting force of friction is the
6. A pair of smith’s tongs is an example of the lever of
7. Two coplanar couples having equal and opposite moments
8. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than
9. The neutral axis of the cross-section a beam is that axis at which the bending stress is
10. A load which is spread over a beam in such a manner that it varies uniformly over the whole length of abeam is called uniformly __________ load.
11. Whenever a material is loaded within elastic limit, stress is __________ strain.
12. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as __________ double cover butt joint.
13. The strain energy stored in a solid circular shaft subjected to shear stress (τ) is (where C = Modulus of rigidity for the shaft material)
14. The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called
15. A beam supported at its both ends is not a simply supported beam.
16. In a simple bending of beams, the stress in the beam varies
17. The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.
18. If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is
19. A concentrated load is one which
21. If the depth is kept constant for a beam of uniform strength, then its width will vary in proportional to (where M = Bending moment)
22. In order to know whether a column is long or short, we must know its slenderness ratio.
23. The limit of eccentricity is based upon no tension condition.
24. When a bar is cooled to - 5°C, it will develop
25. When shear force at a point is zero, then bending moment is __________ at that point.
26. The bending stress in a beam is __________ section modulus.
27. In compression test, the fracture in cast iron specimen would occur along
28. The energy stored in a body when strained within elastic limit is known as
29. The maximum stress produced in a bar of tapering section is at
30. The simply supported beam 'A' of length l carries a central point load W. Another beam 'B' is loaded with a uniformly distributed load such that the total load on the beam is W. The ratio of maximum deflections between beams A and B is
31. The point of contraflexure is a point where
32. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the
33. The torque transmitted by a solid shaft of diameter (D) is (where τ = Maximum allowable shear stress)
34. Strain rosettes are used to
35. A thin cylindrical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is
36. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
37. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
38. The bending moment at a point on a beam is the algebraic __________ of all the moments on either side of the point.
39. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is compressive.
40. In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.
41. A masonry dam may fail due to
42. If the slenderness ratio for a column is 100, then it is said to be a __________ column.
43. A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is
44. The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.
45. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce
46. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
47. Euler's formula holds good only for
49. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
50. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
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