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Strength of Materials Quiz practies questions test1
Strength of Materials Quiz practies questions test1
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1. Modulus of rigidity is defined as the ratio of ______.
longitudinal stress to longitudinal strain
shear stress to shear strain
stress to strain
stress to volumetric strain
2. If the Young's modulus of elasticity of a material is twice its modulus of rigidity, then the Poisson's ratio of the material is _____.
-1
-0.5
0.5
zero
3. Limit of proportionality depends upon ______.
area of cross-section
type of loading
type of material
all of the above
4. For an isotropic, homogeneous and elastic material obeying Hooke's law, number of independent elastic constants is ______.
2
3
9
1
5. In a thin cylindrical shell, the ratio of longitudinal stress to hoop stress is ______.
0.5
1
2
4
6. If all the dimensions of a prismatic bar are doubled, then the maximum stress produced in it under its own weight will
decrease
remain unchanged
increase to two times
increase to four times
7. The relationship between Young's, modulus of elasticity E, bulk modulus K and Poisson's ratio u is given by _____.
E = 2K(l-2u.)
E = 3K(l + u)
E = 3K(l-2u)
E = 2K(l + u)
8. Limiting values of Poisson's ratio are _____.
- 1 and 0.5
-1 and -0.5
1 and - 0.5
0 and 0.5
9. The elongation of a conical bar under its own weight is equal to ______.
that of a prismatic bar of same length
one half that of a prismatic bar of same length
one third that of a prismatic bar of same length
one fourth that of a prismatic bar of same length
10. If a material has identical properties in all directions, it is said to be _____.
homogeneous
isotropic
elastic
orthotropic
11. Two bars of different materials are of the same size and are subjected to same tensile forces. If the bars have unit elongations in the ratio of 4 : 7, then the ratio of moduli of elasticity of the two materials is
7:4
4:7
4:17
16:49
12. A prismatic bar of volume V is subjected to a tensile force in longitudinal direction. If Poisson's ratio of the material is u and longitudinal strain is e, then the final volume of the bar becomes
(l + e)(l-u)2V
(l-e)2(l + ue)V
(l + e)(l-ne)2V
(l-ue)3V
13. If a composite bar of steel and copper is heated, then the copper bar will be under _____.
tension
compression
shear
torsion
14. Effective length of a weld is equal to ______.
overall length - weld size
overall length - throat thickness
overall length - 2 x weld size
overall length - 2 x throat thickness
15. Size of a right angled fillet weld is given by _____.
0.707 x throat thickness
0.414 x throat thickness
2.0 x throat thickness
throat thickness
16. The effective length of a fillet weld designed to transmit axial load shall not be less than _____.
2 x size of weld
4 x size of weld
6 x size of weld
10 x size of weld
17. Size of fillet weld with unequal legs is equal to _____.
smaller leg length
longer leg length
throat thickness
average of smaller and longer leg lengths
18. Weakest section in a fillet weld is ______.
throat of the fillet
smaller side
side parallel to force
side perpendicular to force
19. Effective throat thickness of a fillet weld is _____.
0.707 x size of weld
1.414 x size of weld
a function of the angle between fusion faces
equal to the side of the fillet
20. According to Unwin's formula, the dia¬meter of rivet in mm to suit the t mm thickness of plate is given by _____.
6t
6Vt
1.9-y/t
1.5 t+ 4
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