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FAQ’s from Strength of Materials

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1. In ideal machines

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2. The angle which an inclined plane makes with thehorizontal when a body placed on it is about to movedown is known as angle of

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3. In the lever of third order, load W, effort P andfulcrum F are oriented as follows

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4. The M.I. of hollow circular section about a centralaxis perpendicular to section as compared to its M.I.about horizontal axis is

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5. If three forces acting in different planes can berepresented by a triangle, these will be in

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6. A flywheel on a motor goes from rest to 1000 rpm in6 sec. The number of revolutions made is nearly equal to

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7. The C.G. of a solid hemisphere lies on the centralradius 3r

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8. If n = number of members andy = number of joints,then for a perfect frame, n =

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9. The maximum frictional force which comes into playwhen a body just begins to slide over another surface iscalled

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10. If three forces acting in one plane upon a rigid body,keep it in equilibrium, then they must either

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11. The co-efficient of friction depends upon

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12. The effort required to lift a load W on a screw jackwith helix angle a and angle of friction

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13. Kinetic friction is the

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14. Coulomb friction is the friction between

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15. Limiting force of friction is the

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16. Shear stress induced in a shaft subjected to tensionwill be

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17. A key is subjected to side pressure as well at shearingforces. These pressures are called

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18. The torsional rigidity of a shaft is expressed by the

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19. Longitudinal stress in a thin cylinder is

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20. A boiler shell 200 cm diameter and plate thickness 1.5cm is subjected to internal pressure of 1.5 MN/m , thenthe hoop stress will be

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21. The force acting along the circumference will causestress in the walls in a direction normal to thelongitudinal axis of cylinder; this stress is called

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22. The weakest section of a diamond riveting is thesection which passes through

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23. Diamond riveted joint can be adopted in the case offollowing type of joint

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24. A riveted joint in which every rivet of a row isopposite to other rivet of the outer row, is known as

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25. The ratio of elongation in a prismatic bar due to itsown weight (W) as compared to another similar barcarrying an additional weight (W) will be

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26. A material capable of absorbing large amount ofenergy before fracture is known as

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27. The stress induced in a body due to suddenly appliedload compared to when it is applied gradually is

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28. The total strain energy stored in a body is termed as

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29. In question 56, the internal reaction in bottom 80 cmlength will be

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30. The ratio of lateral strain to the linear strain withinelastic limit is known as

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31. The elasticity of various materials is controlled by its

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32. The stress necessary to initiate yielding is

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33. The property of a material by virtue of which it can bebeaten or rolled into plates is called

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34. The percentage reduction in area of a cast ironspecimen during tensile test would be of the order of

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35. For which material the Poisson’s ratio is more thanunity

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36. The property of a material which allows it to be drawninto a smaller section is called

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37. The value of Poisson’s ratio for cast iron is

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38. The buckling load for a given material depends on

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39. If a part is constrained to move and heated, it willdevelop

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40. Which is the false statement about true stress-strainmethod

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41. The value of Poisson’s ratio for steel is between

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42. During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and areaof cross-section at neck was 0.5 cm2. Ultimate tensilestrength of specimen is

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43. The intensity of stress which causes unit strain iscalled

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44. True stress-strain curve for materials is plottedbetween

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45. The impact strength of a material is an index of its

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46. The Young’s modulus of a wire is defined as the stresswhich will increase the length of wire compared to itsoriginal length

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47. Tensile strength of a material is obtained by dividingthe maximum load during the test by the

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48. The materials having same elastic properties in alldirections are called

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49. It equal and opposite forces applied to a body tend toelongate it, the stress so produced is called

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50. Deformation per unit length in the direction of force isknown as

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