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FAQ’s from Strength of Materials

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1. In actual machines

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

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3. A pair of smith’s tongs is an example of the lever of

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4. Which of the following is the example of lever of firstorder

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5. The C.G. of a plane lamina will not be at itsgeometrical centre in the case of a

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

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7. A body moves, from rest with a constant accelerationof 5 m per sec. The distance covered in 5 sec is mostnearly

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8. Which of the following is not the unit of energy

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

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10. The necessary condition for forces to be inequilibrium is that these should be

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

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12. A particle inside a hollow sphere of radius r, havingcoefficient of friction -rr can rest upto height of

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13. The algebraic sum of moments of the forces formingcouple about any point in their plane is

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

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15. Kinetic friction is the

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16. Tangent of angle of friction is equal to

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17. Dynamic friction as compared to static friction is

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18. A projectile is fired at an angle 9 to the vertical. Itshorizontal range will be maximum when 9 is

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19. Limiting force of friction is the

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20. If rain is falling in the opposite direction of themovement of a pedestrain, he has to hold his umbrella

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21. The value of shear stress which is induced in the shaftdue to the applied couple varies

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

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23. Longitudinal stress in a thin cylinder is

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24. 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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25. 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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26. Diamond riveted joint can be adopted in the case offollowing type of joint

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27. 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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28. A riveted joint in which the number otrivets decreasefrom innermost to outer most row is called

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29. If the rivets in adjacent rows are staggered and theoutermost row has only one rivet, the arrangement of therivets is called

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

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31. Resilience of a material is considered when it issubjected to

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32. When it is indicated that a member is elastic, it meansthat when force is applied, it will

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

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34. The elasticity of various materials is controlled by its

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35. The stress necessary to initiate yielding is

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

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37. The change in the unit volume of a material undertension with increase in its Poisson’s ratio will ,

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

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

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40. The materials which exhibit the same elasticproperties in all directions are called

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41. In a tensile test on mild steel specimen, the breakingstress as compared to ultimate tensile stress is

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

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43. The value of modulus of elasticity for mild steel is ofthe order of

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

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45. The intensity of stress which causes unit strain iscalled

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46. True stress-strain curve for materials is plottedbetween

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

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48. If the radius of wire stretched by a load is doubled,then its Young’s modulus will be

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49. The ultimate tensile stress of mild steel compared toultimate compressive stress is

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

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