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Presentation ON SIMPLE STRESSES AND STRAINS (Quiz-2) ONLINE EXAMINATION

STRENGTH OF MATERIAL. Presentation ON SIMPLE STRESSES AND STRAINS (Quiz-2) ONLINE EXAMINATION. STRENGTH OF MATERIAL.

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Presentation ON SIMPLE STRESSES AND STRAINS (Quiz-2) ONLINE EXAMINATION

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  1. STRENGTH OF MATERIAL Presentation ON SIMPLE STRESSES AND STRAINS (Quiz-2) ONLINE EXAMINATION

  2. STRENGTH OF MATERIAL • A cube of 130mm side is subjected to like compressive force on each face. The change in volume is observed to be 3500 mm3. If bulk modulus of material is 150 Gpa, the magnitude of compressive force on cube is. • 1102 KN • 1824 KN • 3800 KN • 4038 KN Ans: d

  3. STRENGTH OF MATERIAL • 2. A bar of 25mm diameter subjected to a load of 35KN, the extension over a gauge length of 200 mm is 0.12mm and contraction in diameter is 0.0036mm. The Poisson’s ratio is • 0.10 • 0.12 • 0.24 • 0.3 Ans: C

  4. STRENGTH OF MATERIAL 3. A bar of 25mm diameter subjected to a load of 40KN, the deformation of bar over a length and 200 mm is 0.22mm. Poisson’s ratio is 0.3 then the modulus rigidity is, 25 KN/mm2 28.50KN/mm2 28.75KN/mm2 30KN/mm2 Ans: b

  5. STRENGTH OF MATERIAL 4.A concrete column is made by reinforcing steel bar in the column. Under the compressive load, stress in concrete is 15 Mpa. What is the stress in steel if Esteel = 15Econcrete a) 100Mpa b) 225Mpa c) 115Mpa d) 150Mpa Ans: b

  6. STRENGTH OF MATERIAL 5. A rod of 600 mm long and 100 mm2 in c/s is subjected to an axial load of 60 KN. If modulus of Elasticity is 2.1 x 105 N/ MM2, then strain in rod is, 0.002 0.00286 0.003 0.00386 Ans: b

  7. STRENGTH OF MATERIAL 6. A cast iron block is 5cm2 cross-section carries an axial tensile load of 10T. The maximum axial stress in the block is given by a) 2000 kg/cm2 b) 1000 kg/cm2 c) 500 kg/cm2 d) 250 kg/cm2 Ans: a

  8. STRENGTH OF MATERIAL 7.The strain induced in a rectangular section having width is equal to twice the depth, is 2.5x10-5.The bar is subjected to a tensile load of 4KN. Take E= 0.2 x 106 N/mm2.The depth of bar is, 45 28 34 20 Ans: d

  9. STRENGTH OF MATERIAL 8.A wire of length L & radius ‘a’ is rigidly fixed at one rod. On other end wire has applied force F, the increase in its length is L. If another wire of same material having length 2L & radius 2a, it has applied force 2F, then increase in length will be, L L/4 2L L/2 Ans: a

  10. STRENGTH OF MATERIAL 9. The steel tube has an internal diameter of 25 mm, thickness 5 mm & length 3m. It is subjected to an axial pull of 75 KN, Then change in length of the tube is….. (E = 200 GPa) a) 3.2mm b) 2.4 mm c) 2.8 mm d) 3.8 mm Ans: b

  11. STRENGTH OF MATERIAL 10. A rod 10 mm long at100 C is heated to 70 0 C. If the free expansion is prevented, the magnitude of thermal stress is, (Take E= 210 Gpa, Coefficient of thermal Expansion = 12 x 10-6 /0C) a)151.2 Mpa b) 73.6 Mpa c) 103.5 Mpa d) 211.5 Mpa Ans: a

  12. STRENGTH OF MATERIAL • 11.A bar 100 mm long and 10mm in diameter is subjected to axial tensile load. Change in length is 30 times as change in diameter. Poisson’s ratio of material is, • 0.25 • 0.33 • 0.30 • 0.20 Ans: b

  13. STRENGTH OF MATERIAL 12. The extension of a circular bar tapering uniformly from diameter d1 at one end diameter d3 at the other end, and subjected to an axial pull of P is given by, a) ∂ℓ = 4PE/(ld2) b) ∂ℓ = (4P/d2)/PE c)∂ℓ = 4Pl/(Ed1d2) d) ∂ℓ =( 4PlE)/ d1d2 Ans: c

  14. STRENGTH OF MATERIAL 13.A bar having area 100 mm2 If E= 200 x 109 Pa. then total elongation in rod will be, 12 mm 15 mm O mm 1 mm Ans: c

  15. STRENGTH OF MATERIAL 14.A rail 20 m long is prevented from expansion at both ends. If the temperature is raised by 300 C, stress induced in rail is, ( E= 200 Gpa, α= 12 x 10-6/0 C ) 48 Mpa 24 Mpa 94 Mpa 72 Mpa Ans: d

  16. STRENGTH OF MATERIAL 15. A metal bar of length is inserted between two rigid supports and its temperature is increased by 100 C. If coefficient of linear expansion is 12 x 10 -6 /0 C. E= 2 x 105 Mpa, then stress will 24 Mpa, 12 Mpa 48 mpa 36 Mpa Ans: a

  17. STRENGTH OF MATERIAL • 16.An axial tensile force is acting on body and normal strain in axial direction is 1.25 x 10-3.If poisson’s ratio is 0.3. What will be volumetric strain in body. • 4 x 10-4 • 5 x 10-4 • 1.3 x10-4 • 1.7 x 10-4 Ans: b

  18. STRENGTH OF MATERIAL • 17.An aluminium bar of 20 mm diameter is enclosed in a steel tube inner diameter 20 mm and outer diameter 30 mm . An axial load produces a stress of 30 Mpa in steel tube. What is the stress induced Aluminium bar, take Es = 3 EAl • 90 Mpa • 60 Mpa • 28 mpa • 10 Mpa Ans: d

  19. STRENGTH OF MATERIAL • 18. A steel cube of dimensions 10 mm x 10 mm x 10 mm is subjected to stresses σx=100MPa (T) , σy=100MPa (C) and σz=100MPa (T). If the modulus of elasticity of steel is 200 GPa and Poisson’s ratio is 0.25, the change in volume of the cube is mm3. • 0.20 • 0.125 • 0.25 • 0.375 Ans: c

  20. STRENGTH OF MATERIAL • 19. A steel cube of dimensions 10mm x 10mm x 10mm is subjected to stresses σx=50MPa (C) and σz=100MPa (T). The modulus of elasticity of steel is 200 GPa and Poisson’s ratio is 0.25. If the change in volume of the cube is required to be zero, the force to be applied along y- direction is, • 0 • 5KN(T) • 5KN(C) • 0.5KN(C) Ans: c

  21. STRENGTH OF MATERIAL 20. Maximum stress reached in a ductile material is known as • Yield stress • Ultimate stress • Rupture stress • All of above Ans: b

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