1. The portion, which should be removed from top and bottom of a circular cross section of
diameter d in order to obtain maximum section modulus, is
Correct : C. 0.011 d
2. A beam of overall length / rests on two simple supports with equal overhangs on both sides. Two equal loads act at the free ends. If the deflection at the centre of the beam is the same as at either end, then the length of either overhang is
Correct : A. 0 152 1
3. A beam ABC rests on simple supports at A and B with BC as an overhang. D is centre of span AB. If in the first case a concentrated load P acts at C while in the second case load P acts
at D, then the
Correct : A. deflection at D in the first case will be equal to the deflection at C in the second case
4. If the deflection at the free end of a uniformly loaded cantilever beam is 15mm and the slope of the deflection curve at the free end is 0.02 radian, then the length of the beam is
Correct : B. lm
5. A cantilever beam carries a uniformly distributed load from fixed end to the centre of the beam in the first case and a uniformly distributed load of same inten¬sity from centre of the beam to the free end in the second case. The ratio of deflections in the two cases is
Correct : D. 7/41
6. If the length of a simply supported beam carrying a concentrated load at the centre is
doubled, the defection at the centre will become
Correct : C. eight times
7. A simply supported beam with rectangular cross-section is subjected to a central concentrated load. If the width and depth of the beam are doubled, then the deflection at the centre of the beam will be reduced to
Correct : D. 6.25%
8. A laminated spring is given an initial curvature because
Correct : C. spring becomes flat when it is subjec-ted to design load
9. A laminated spring is supported at
Correct : B. centre and loaded at ends
10. Laminated springs are subjected to
Correct : B. bending stress
11. Deflection in a leaf spring is more if its
Correct : C. stiffness is less
12. Buckling load for a given column depends upon
Correct : C. both length and least lateral dimension
13. When both ends of a column are fixed, the crippling load is P. If one end of the column is made free, the value of crippling load will be changed to
Correct : A. P/16
14. Euler's formula for a mild steel long column hinged at both ends is not valid for slenderness
ratio
Correct : B. less than 80
15. A long column has maximum crippling load when its
Correct : B. both ends are fixed
16. Effective length of a chimney of 20 m height is taken as
Correct : D. 40m
17. Rankine's formula for column is valid when slenderness ratio
Correct : D. has any value
18. Slenderness ratio of a 5 m long column hinged at both ends and having a circular crosssection with diameter 160 mm is
Correct : D. 125
19. The effect of arching a beam is
Correct : A. to reduce bending moment throughout
20. Internal forces at every cross-section in a arch are
Correct : D. normal thrust, shear force and bending moment
21. According to Eddy's theorem, the vertical intercept between the linear arch and the centre
line of actual arch at any point represents to some scale
Correct : A. bending moment
22. Due to rise in temperature in a three hinged arch, induced stress is
Correct : D. none of the above
23. In a three hinged arch, the linear and the actual arch meet at
Correct : A. at least three points
24. If a three hinged parabolic arch carries a uniformly distributed load over the entire span, then
any section of the arch is subjected to
Correct : A. normal thrust only
25. Three hinged arch is
Correct : C. statically determinate
26. A linear arch has
Correct : A. normal thrust only
27. A three hinged arch is carrying uniformly distributed load over the entire span. The arch is
free from shear force and bending moment if its shape is
Correct : B. parabolic
28. For a determinate pin-jointed plane frame, the relation between the number of joints j and
members m is given by
Correct : A. m = 2j - 3
29. The basic perfect frame is a
Correct : A. triangle
30. Method of joints is applicable only when the number of unknown forces at the joint under
consideration is not more than
Correct : B. two
31. A short column of external diameter of 250 mm and internal diameter of 150 mm carries an eccentric load of 1000 kN. The greatest eccentricity which the load can have without producing tension anywhere is
Correct : D. 42.5 mm
32. Proof resilience is the maximum energy stored at
Correct : B. elastic limit
33. Strain energy stored in a member is given by
Correct : C. 0.5 x stress x strain x volume
34. A rectangular block of size 200 mm x 100 mm x 50 mm is subjected to a shear stress of 100 N/mm2. If modulus of rigidity of material is 1 x 105 N/mm2, strain energy stored will be
Correct : C. 50 N.m
35. A steel rod of cross sectional area equal to 1000 mm2 is 5 m long. If a pull of 100 kN is suddenly applied to it, then the maximum stress intensity will be
Correct : C. 200 N/mm2
36. If the depth of a beam of rectangular section is reduced to half, strain energy stored in the
beam becomes
Correct : D. 8 times
37. The specimen in a Charpy impact test is supported as a
Correct : B. simply supported beam
38. Impact test enables one to estimate the property of
Correct : B. toughness
39. A fletched beam is used to
Correct : C. Equalize the strength in tension and compression
40. The property of metal which allows it to deform continuously at slow rate without any further increase in stress is known as
Correct : B. creep
41. The stress below which a material has a high probability of not failing under reversal of
stress is known as
Correct : B. elastic limit
42. A three hinged parabolic arch rib is acted upon by a single load at the left quarter point. If the central rise is increased and the shape of arch altered to segmental without changing the other details, the horizontal thrust will
Correct : B. decrease definitely
43. For ductile materials, the most appropriate failure theory is
Correct : A. maximum shear stress theory
44. At a point in a steel member, the major principal stress is 2000 kg/cm2 and the minor principal stress is compressive. If the uni-axial tensile yield stress is 2500 kg/cm2, then the magnitude of the minor principal stress at which yielding will commence, according to the maximum shearing stress theory, is
Correct : D. 500 kg/cm2
45. For the design of a cast iron member, the most appropriate theory of failure is
Correct : B. Rankine's theory
46. In a riveted joint, when the rivets in the various rows are opposite to each other, the joint is said to be
Correct : A. chain riveted
47. Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is
Correct : D. 15 ? 16
48. The ratio of change in volume to the original volume is called
Correct : C. volumetric strain
49. The ratio of bulk modulus to Young's modulus for a Poisson's ratio of 0.25 will be
Correct : B. 2 ? 3
50. If the section modulus of a beam is increased, the bending stress in the beam will
Correct : C. decrease
51. A body is subjected to two normal stresses 20 kN / m2 (tensile) and 10 kN / m2 (compressive) acting perpendicular to each other. The maximum shear stress is
Correct : C. 15 kN / m2
52. In order to avoid sliding of masonry dam, the force of friction between the dam and soil should be at least
Correct : B. 1.5 times
53. In a beam of uniform strength, the bending stress developed is constant and is equal to the allowable stress at every section of the beam.
Correct : A. True
54. The rectrangular 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
Correct : B. double
55. A rod is enclosed centrally in a tube and the assembly is lightened by rigid washers. If the assembly is subjected to a compressive load, then
Correct : C. both rod and tube are under compression
56. The shear force in the centre of a simply supported beam carrying a uniformly distributed load of w per unit length, is
Correct : A. zero
57. A beam of triangular section is placed with its base horizontal. The maximum shear stress occurs at
Correct : B. mid of the height
58. The stress developed in the material without any permanent set is called
Correct : A. elastic limit
59. The ductility of a material
Correct : A. increases
60. The rectrangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and width but depth is double that of 'A'. The elastic strength of beam B will be
Correct : C. four times
61. A bar of length L metres extends by l mm under a tensile force of P. The strain produced in the bar is
Correct : D. 0.001 l / L
62. In the Euler's formula, the value of C for a column with one end fixed and the other end free, is
Correct : D. 4
63. The maximum stress produced in a bar of tapering section is at
Correct : A. smaller end
64. In a thin cylindrical shell subjected to an internal pressure p, the ratio of longitudinal stress to the hoop stress is
Correct : A. 1 ? 2
65. When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal
Correct : B. polar modulus
66. In a simple bending theory, one of the assumption is that the material of the beam is isotropic. This assumption means that the
Correct : C. elastic constants are same in all the directions
67. For the two shafts connected in parallel and sub-jected to twisting moment, the angle of twist of each shaft will be same.
Correct : A. Yes
68. A tensile test is performed on a round bar. After fracture it has been found that the diameter remains approximately same at fracture. The material under test was
Correct : B. cast iron
69. The compressive strength of brittle materials is
Correct : C. greater than
70. Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter.
Correct : B. False
71. A welded joint as compared to a riveted joint has
Correct : C. more
72. The shear force of a cantilever beam of length l carrying a uniformly distributed load of w per unit length is
Correct : A. zero
73. The bending moment at a point on a beam is the algebraic
Correct : A. sum
74. In the Euler's formula, the value of C for a column with one end fixed and the other end hinged, is 1 / 2.
Correct : A. True
75. The bending moment diagram for a simply supported beam carrying a uniformly distributed load of w per unit length, will be
Correct : D. a parabolic curve
76. Every direct stress is always accompanied by a strain in its own direction and an opposite kind of strain in every direction, at right angles to it. Such a strain is known as
Correct : B. lateral strain
77. The bending stress in a beam is
Correct : D. directly proportional to
78. The section nodulus (Z) of a beam is given by
Correct : A. I / y
79. According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end free is
Correct : B. less than
80. A shear stress across a plane, is always accompanied by a balancing shear stress across the plane and normal to it.
Correct : B. False
81. 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
Correct : C. 1 ? 2
82. A lap joint is always in
Correct : A. single
83. The shear force and bending moment zre zero at the free end of a cantilever beam, if it carries a
Correct : C. uniformly distributed load over the whole length
84. In a thick cylindrical shell subjected to an internal pressure (p), the radial stress across the thickness of a cylinder is
Correct : D. maximum at the inner surface and zero at the outer surface
85. The forsional rigidity of a shaft is given by
Correct : B. T / ?
86. In a tensile test, when the material is stressed beyond elastic limit, the tensile strain
Correct : D. increases more quickly
87. Within elastic limit, shear stress is
Correct : C. directly proportional to
88. A cantilever beam of length / carries a gradually varying load from zero at free end and w per unit length at the fixed end. The maximum deflection oes at
Correct : A. free end
89. The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional area is
Correct : D. 9 ? 8
90. The rivets are used for
Correct : A. permanent
91. The maximum deflection of a fixed beam carrying a central point load lies at
Correct : B. centre of beam
92. Hook's law holds good up to
Correct : B. elastic limit
93. At the neutral axis of a beam, the shear stress is
Correct : C. maximum
94. The bending moment on a section is maximum where shear force is
Correct : C. changing sign
95. In a thick cylindrical shell subjected to an internal pressure (p), the tangential stress across the thickness of a cylinder is
Correct : B. maximum at the inner surface and minimum at the outer surface
96. The shear modulus of most materials with respect to the modulus of elasticity is
Correct : B. less than half
97. The maximum shear stress developed in a beam of rectangular section is
Correct : C. 1.5 times
98. The maximum shear stress of a beam of triangular section occurs above the neutral axis.
Correct : A. Correct
99. Which of the following is a proper sequence?
Correct : A. proportional limit, elastic limit, yielding, failure
100. Parallel fillet welds are designed for bending strength.