FAQ’s from Strength of Materials

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1. In actual machines

1. mechanical advantage is greater than velocity ratio

2. mechanical advantage is equal to velocity ratio

3. mechanical advantage is less than velocity ratio

4. mechanical advantage is unity

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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

1. friction

2. limiting friction

3. repose

4. kinematic friction

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

1. W between P and F

2. F between W and P

3. P between W and F

4. W, P and F all on one side

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

1. zeioth order

2. first order

3. second order

4. third order

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

1. arm of man

2. pair of scissors

3. pair of clinical tongs

4. all of the above

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

1. same

2. double

3. half

4. four times

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

1. j-2

2. 2j-l

3. 2/-3

4. 3/-2

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

1. meet in a point

2. be all parallel

3. at least two of them must meet

4. all the above are correct

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

1. r/2

2. r/A

3. r/%

4. 0.134 r

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

1. equal to the moment of the couple

2. constant

3. both of above are correct

4. both of above are wrong

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11. Kinetic friction is the

1. tangent of angle between normal reac-tion and the resultant ofnormal reac-tion and the limiting friction

2. ratio of limiting friction and normal reaction

3. the friction force acting when the body is just about to move

4. the friction force acting when the body is in motion

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12. Tangent of angle of friction is equal to

1. kinetic friction

2. limiting friction

3. angle of repose

4. coefficient of friction

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13. Dynamic friction as compared to static friction is

1. same

2. more

3. less

4. may be less of more depending on nature of surfaces andvelocity

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

1. 0°

2. 30°

3. 45°

4. 60°

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15. Limiting force of friction is the

1. tangent of angle between normal-reaction and the resultant ofnormal reaction and limiting friction

2. ratio of limiting friction and normal reaction

3. the friction force acting when the body is just about to move

4. the friction force acting when the body is in motion

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

1. bearing stresses

2. fatigue stresses

3. crushing stresses

4. resultant stresses

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

1. from maximum at the center to zero at the circumference

2. from zero at the center to maximum at the circumference

3. from maximum at the center to mini-mum at the cricumference

4. from minimum at the centro to maxi-mum at the circumference

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18. The safe twisting moment for a compound shaft isequal to the

1. maximum calculated value

2. minimum calculated value

3. mean value

4. extreme value

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19. Longitudinal stress in a thin cylinder is

1. half of the hoop stress

2. one-fourth of hoop stress

3. equal to the hoop stress

4. twice the hoop stress

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

1. longitudinal stress

2. hoop stress

3. yeiled stress

4. ultimate stress

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

1. butt joint

2. lap joint

3. double riveted lap joints

4. all types of joints

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22. Efficiency of a riveted joint is the ratio of its strength(max. load it can resist without failure) to the strength ofthe unpunched plate in

1. tension

2. compression

3. bearing

4. All of the above

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

1. chain riveting

2. zig zag riveting

3. diamond riveting

4. criss-cross riveting

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24. 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

1. 1:02

2. 1:03

3. 1:04

4. 01:03.0

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

1. same

2. half

3. two times

4. four times

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26. Proof resilience per material is known as

1. resilience

2. proof resilience

3. modulus of resilience

4. toughness

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

1. frequent heat treatment

2. fatigue

3. creep

4. shock loading

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28. The energy absorbed in a body, when it is strainedwithin the elastic limits, is known as

1. strain energy

2. resilience

3. proof resilience

4. modulus of resilience

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29. Flow stress corresponds to

1. fluids in motion

2. breaking point

3. plastic deformation of solids

4. rupture stress

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

1. not deform

2. be safest

3. stretch

4. not stretch

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

1. same in both cases

2. zero in first case

3. different in both cases

4. data are not sufficient to determine same

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32. The stress at which extension of the material takesplace more quickly as compared to the increase in load iscalled

1. elastic point of the material

2. plastic point of the material

3. breaking point of the material

4. yielding point of the material

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33. Rupture stress is

1. breaking stress

2. maximum load/original cross-sectional area

3. load at breaking point/A

4. load at breaking point/neck area

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34. The stress necessary to initiate yielding is

1. considerably greater than that necessary to continue it

2. considerably lesser than that necessary to continue it

3. greater than that necessary to stop it

4. lesser than that necessary to stop it

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35. The stress developed in a material at breaking pointin extension is called

1. breaking stress

2. fracture stress

3. yield point stress

4. ultimate tensile stress

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36. If a material expands freely due to heating it willdevelop

1. thermal stresses

2. tensile stress

3. bending

4. no stress.

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

1. malleability

2. ductility

3. plasticity

4. elasticity

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38. In a tensile test, near the elastic limit zone, the

1. tensile strain increases more quickly

2. tensile strain decreases more quickly

3. tensile strain increases in proportion to the stress

4. tensile strain decreases in proportion to the stress

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

1. steel

2. copper

3. aluminium

4. none of the above.

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

1. plasticity

2. ductility

3. elasticity

4. malleability

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

1. 0.1 to 0.2

2. 0.23 to 0.27

3. 0.25 to 0.33

4. 0.4 to 0.6

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42. The property of a material by virtue of which a bodyreturns to its original, shape after removal of the load iscalled

1. plasticity

2. elasticity

3. ductility

4. malleability

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

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

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44. The buckling load for a given material depends on

1. slenderness ratio and area of cross-section

2. Poisson’s ratio and modulus of elasticity

3. slenderness ratio and modulus of elasticity

4. slenderness ratio, area of cross-section and modulus of elasticity

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

1. It does not exist

2. It is more sensitive to changes in both metallurgical andmechanical conditions

3. It gives, a more accurate picture of the ductility

4. It can be correlated with stress-strain values in other tests liketorsion, impact, combined stress tests etc.

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

1. 2.1xl05 kg/cm2

2. 2.1 X 106 kg/cm2

3. 2.1 x 107 kg/cm2

4. 0.1 xlO6 kg/cm2 (<?) 3.8 x 106 kg/cm2.

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47. Which of the following has no unit

1. kinematic viscosity

2. surface tension

3. bulk modulus

4. strain

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48. Percentage reduction of area in performing tensiletest on cast iron may be of the order of

1. 50%

2. 25%

3. 0%

4. 15%

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49. True stress-strain curve for materials is plottedbetween

1. load/original cross-sectional area and change in length/originallength

2. load/instantaneous cross-sectional area original area and log.

3. load/instantaneous cross-sectional area and change inlength/original length

4. load/instantaneous area and instantaneous area/original area

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

1. doubled

2. halved

3. become four times

4. remain unaffected.

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