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. 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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3. 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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4. 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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5. The C.G. of a plane lamina will not be at itsgeometrical centre in the case of a

1. right angled triangle

2. equilateral triangle

3. square

4. circle

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

1. non-equilibrium

2. partial equilibrium

3. full equilibrium

4. unpredictable

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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

1. 38 m

2. 62.5 m

3. 96 m

4. 124 m

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

1. kg m

2. kcal

3. wattr

4. watt hours

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

1. coplanar

2. meet at one point

3. both a and b above

4. all be equal

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

1. limiting friction

2. sliding friction

3. rolling friction

4. kinematic friction

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12. 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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13. 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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14. The effort required to lift a load W on a screw jackwith helix angle a and angle of friction

1. Wtan(a + <)>)

2. Wtan(a-<)>)

3. Wcos(a + <t>)

4. Wsin(a + <(>)

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15. 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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16. 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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17. 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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18. 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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19. 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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20. If rain is falling in the opposite direction of themovement of a pedestrain, he has to hold his umbrella

1. more inclined when moving

2. less inclined when moving

3. more inclined when standing

4. less inclined when standing

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

1. maximum torque it can transmit

2. number of cycles it undergoes before failure

3. elastic limit up to which it resists torsion, shear and bendingstresses

4. torque required to produce a twist of one radian per unit lengthof shaft

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23. 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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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

1. 30 MN/m2

2. 50 MN/m2

3. 100 MN/m2

4. 200 MN/m2

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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

1. longitudinal stress

2. hoop stress

3. yeiled stress

4. ultimate stress

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

1. chain riveted joint

2. diamond riveted joint

3. criss-cross riveted joint

4. zig-zag riveted joint

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

1. chain riveted joint

2. diamond riveted joint

3. criss-cross riveted joint

4. zig-zag riveted joint

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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

1. chain riveting

2. zig zag riveting

3. diamond riveting

4. criss-cross riveting

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

1. ductility

2. toughness

3. resilience

4. shock proof

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31. 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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32. 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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33. 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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34. The elasticity of various materials is controlled by its

1. ultimate tensile stress

2. proof stress

3. stress at yield point

4. stress at elastic limit

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35. 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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36. 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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37. The change in the unit volume of a material undertension with increase in its Poisson’s ratio will ,

1. increase

2. decrease

3. remain same

4. increase initially and then decrease

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38. 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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39. 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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40. The materials which exhibit the same elasticproperties in all directions are called

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

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

1. more

2. less

3. same

4. more/less depending on composition

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42. 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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43. 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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44. The value of Poisson’s ratio for steel is between

1. 0.01 to 0.1

2. 0.23 to 0.27

3. 0.25 to 0.33

4. 0.4 to 0.6

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45. The intensity of stress which causes unit strain iscalled

1. unit stress

2. bulk modulus

3. modulus of rigidity

4. modulus of elasticity

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

1. toughness

2. tensile strength

3. capability of being cold worked

4. hardness

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

1. same

2. more

3. less

4. unpredictable.

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

1. internal resistanpe

2. tensile stress

3. transverse stress

4. compressive stress

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