1. In case of non-dilatent materials, the maximum value of Poisson's ratio is
Correct : A. 0.5
2. A self-supporting steel chimney transmits the lateral forces to the foundation by
Correct : C. cantilever action
3. The phenomenon under which the strain of a material varies under constant stress is known as
Correct : D. Creep
4. The strength of a riveted plate in tearing should be based on
Correct : B. the rivet hole diameter
5. The Erichsen cupping number of a sheet metal indicates its
Correct : B. Drawing quality
6. The limiting value of span to depth ratio will be least in case of
Correct : D. cantilever slabs
7. A load of 10,000 kg is applied to copper cylinder 20 cm long and 5 cm in diameter causes the length to increase by 4 mm and diameter to decrease by 0.4 mm. The Poisson's ratio for copper would be
Correct : B. 0.4
8. The allowable stresses for the design of steel chimney depend upon the ratio of
Correct : D. effective height to the radius of gyration
9. When a beam having square cross-section is loaded longitudinally, the shear stress develops
Correct : C. Equally on each fibre along horizontal plane
10. A solid circular shaft and a thin walled circular tube made of the same material and having the same weight are stressed in torsion to the same maximum shear stress. The ratio of the amounts of strain energy stored in the two shafts would be
Correct : D. ?
11. A bolt of nominal diameter 33 mm having a safe tensile stress of 100 N/mm2 can safely carry a load of
Correct : E. 60 kN
12. The number of elastic constants for a completely anisotropic elastic material which follows Hooke's law, is
Correct : B. 21
13. A masonry dam is liable to fail
Correct : E. Any of the above
14. The modulus of resilience in tension is nearly
Correct : D. 260 kJ/m3
15. The shape of the Kem area for a rectangular section is
Correct : D. Parallelogram
16. For any shaft the number of critical speed is
Correct : A. infinite
17. The ratio of Bulk modulus to shear modulus for Poisson's ratio of 0.25 will be
Correct : A. 5?3
18. In case of a hinged support, the reaction
Correct : C. Acts in a direction opposite to the resultant shear force at the support
19. The limiting values of Poisson's ratio are
Correct : D. ?1 and +0.5
20. The effect of arching a beam is to
Correct : C. reduce the bending moment throughout
21. A beam supported at more than two places is known as
Correct : C. Continuous beam
22. A spring steel ribbon 3.2 mm wide, 0.5 mm thick is wound on a 500 mm diameter cylinder. If E = 2 x 105 N/mm2, the maximum stress in the steel will be
Correct : B. 200 N/mm2
23. In a universal testing machine during the testing of a specimen of original cross-sectional area 1 cm2 the maximum load appliied was 7.5 tonnes and neck area 0.6 sq. cm. The ultimate tensile strength of the specimen is
Correct : C. 7.5 tonnes/cm2
24. It is desired to punch a hole of 20 mm diameter in a plate 20 mm think. If the shear stress of mild steel is 30 kg/mm2, the force necessary for punching would be approximately in the range
Correct : D. 35 - 40 tonnes
25. A spherical pressure vessel is made of thin magnesium plate 0.25 cm thick. The main diameter of the sphere is 600 cm and allowable stress in tension is 900 kg/cm2. The safe internal gas pressure for the vessel would be
Correct : E. 1.5 kg/cm2
26. Materials exhibiting time bound behaviour are known as
Correct : B. Visco elastic
27. The shear stress when a circular shaft subjected to torsion is
Correct : C. maximum, minimum
28. The deflection of a beam may be reduced by
Correct : C. providing greater end restrains
29. The safe working pressure for a spherical vessel 1.5 m diameter and 1.5 cm wall thickness with limiting tensile stress of 450 kg/cm2 would be
Correct : A. 18 kg/cm2
30. For a shear force to be uniform throughout the span of a simply supported beam, it should be subjected to
Correct : A. a couple at mid span
31. A cylindrical section having no joint is known as
Correct : D. Seamless section
32. Poisson's ratio for cast iron is
Correct : C. 0.27
33. A beam of uniform strength is one in which
Correct : A. The bending stress is same at every section
34. A material which undergoes no deformation till its yield point is reached and then it flows at a constant stress is known as
Correct : B. Rigid-plastic
35. The neutral axis of beam
Correct : C. Has tensile stress on one side and compressive stress on the other
36. For which of the following diameters a seam-less pipe of 3 mm wall thickness will be considered as a thin walled cylinder?
Correct : A. 30 mm
37. All elastic materials
Correct : A. Elongate on the application of load
38. The heaviest I section for the same depth is
Correct : C. ISHB
39. When a no. of loads rest upon a beam, the deflection at any point is equal to the sum of the deflections at this point due to each of the loads taken separately. This is according to
Correct : E. Max's well theorem
40. A form factor is introduced in the design of compressive members to represent the effect of
Correct : A. local buckling
41. As compared to the Brinell hardness lest, the Rockwell method
Correct : A. makes a thinner indentation
42. Two cantilever beams are of equal length. One carries a uniformly distributed load and other carries same load but concentrated at the free end. The ratio of maximum deflection is
Correct : E. 5?6
43. In a three-hinged beam, the bending moment will be zero at
Correct : D. the crown
44. Arching of a beam results in
Correct : B. reduced bending moment throughout
45. A dead load is
Correct : D. One that remains constant.
46. In the simple bending theory one of the assumptions usually made is that the plane sections before bending remain plane after bending. This assumption implies that
Correct : E. Strain is proportional to the distance from the neutral axis
47. Along the principal plane subjected to maximum principal shear
Correct : C. No shear stress acts
48. If the value of Young's modulus of elasticity for a material is zero, it implies that the material
Correct : C. incompressible
49. A steel shaft 6 mm in diameter turns at 10,000 r.p.m. the safe working stress in shear is 350 kg/cm2. The maximum power that such a shaft may develop is approximately
Correct : A. 2
50. The area around the centre of gravity of a cross-section within which any load applied will produce stress of only one sign throughout the entire cross-section, is known as
Correct : C. Kern
51. In case of thin walled cylinders the ratio of longitudinal stress to shear stress is
Correct : A. 2
52. A live load is one that
Correct : A. Varies continuously
53. Within elastic limits the greatest amount of strain energy per unit volume that a material can absorb is known as
Correct : D. Proof resilience
54. The deformation of a steel bar under its own weight as compared to the deformation caused by a direct load equal to the weight of the shaft will be
Correct : D. Half
55. Two shafts of the same material are subjected to the same torque. If the first shaft is of solid circular section and the second shaft is of hollow section whose internal diameter is 2/3 of the outside diameter, the ratio of weights of hollow shaft to solid shaft would be
Correct : C. Between 0.5 to 0.99
56. A solid cube is subjected to equal normal forces of the same type on all its faces. The ratio volumetric strain/liner strain in any of the three xes will be
Correct : A. 3
57. With a punch for which the maximum crushing stress is 4 times the maximum shearing stress of the plate, the biggest hole that can be punched in the plate would be of diameter equal to
Correct : B. Thickness of plate
58. A sheet metal 2 mm thick having a shear strength of 40 kg/cm2 is to receive a punch hole of 35 mm diameter. The force required to make the punching will be
Correct : B. 88 kg
59. The numerical value of Young's modulus of elasticity in ascending order for glass, aluminium, copper, wrought iron and tungsten are given by
Correct : A. Glass, aluminium, copper, wrought, iron, tungsten
60. Elasticity is the property of the material due to which it can be
Correct : E. None of the above
61. An underground pipeline is laid in spring at 35?C. If the pipe is unable to contract, during winter when temperature drops to 5?C, the pipe will be under
Correct : D. tensile stress
62. The maximum bending moment due to a moving load on a fixed ended beam occurs
Correct : D. at a support
63. The stress strain curve for a glass rod during tensile test would exhibit
Correct : C. A sudden break
64. The ratio of the area under the bending moment diagram between any two points along a beam to the flexural rigidity EI gives the change to the following parameter between the two points
Correct : C. slope
65. The maximum strains at the end of plastic range of structural steel is about
Correct : B. 1.5 percent
66. When the deformation arising from change of temperature is presented, the stresses set up are known as
Correct : D. Thermal stresses
67. A beam of uniform strength is the one in which
Correct : C. Bending stress is same in every section along the longitudinal axis
68. In design of a shaft, pulley and key for a system
Correct : C. Key is the weakest member
69. In case of a beam subjected to pure bending
Correct : C. The stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis
70. A mild steel bolt of net cross-sectional area 8.4 sq. cm, diameter 37 will be safe to take a tensile load of about
Correct : C. 30 tonnes
71. The stress at neutral axis is
Correct : A. Zero
72. The ratio of bending moment at the centre of a simply supported beam of effective length L subjected to a central load W with that when the load W is uniformly distributed, will be
Correct : C. 2
73. A cantilever beam of square section is subjected to a load W at the free end. If the length of the beam is doubled and load reduced to half, the deflection at the free end as compared to original deflection would be