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

1. 25

2. 50

3. 100

4. 250

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6. Which of the following is the locus of a point thatmoves in such a manner that its distance from a fixedpoint is equal to its distance from a fixed line multipliedby a constant greater than one

1. ellipse

2. hyperbola

3. parabola

4. circle

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7. The co-efficient of friction depends upon

1. nature of surfaces

2. area of contact

3. shape of the surfaces

4. ail of the above.

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8. 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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9. A single force and a couple acting in the same planeupon a rigid body

1. balance each other

2. cannot balance each other

3. produce moment of a couple

4. are equivalent

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10. 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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11. 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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12. 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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13. 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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14. 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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15. The deformation of a bar under its own weightcompared to the deformation of same body subjected to adirect load equal to weight of the body is

1. same

2. double

3. half

4. four times

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16. Rivets are made of following type of material

1. tough

2. hard

3. resilient

4. ductile

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17. 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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18. 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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19. 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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20. 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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21. In riveted boiler joints, all stresses, shearing, bearingand tensile are based on the

1. size of rivet

2. size of the drilled or reamed hole

3. average of size of rivet and hole

4. smaller of the two

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22. In a prismatic member made of two materials sojoined that they deform equally under axial stress, theunit stresses in two materials are

1. equal

2. proportional to their respective moduli of elasticity

3. inversely proportional to their moduli of elasticity

4. average of the sum of moduli of elas-ticity

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23. A non-yielding support implies that the

1. support is frictionless

2. support can take any amount of reaction

3. support holds member firmly

4. slope of the beam at the support is zero

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24. A beam is loaded as cantilever. If the load at the end isincreased, the failure will occur

1. in the middle

2. at the tip below the load

3. at the support

4. anywhere

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25. 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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26. Flow stress corresponds to

1. fluids in motion

2. breaking point

3. plastic deformation of solids

4. rupture stress

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

1. Young’s modulus

2. bulk modulus

3. Poisson’s ratio.

4. modulus of elasticity

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29. 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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30. 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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31. 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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32. 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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33. The percentage reduction in area of a cast ironspecimen during tensile test would be of the order of

1. more than 50%

2. 25—50%

3. 10—25%

4. negligible.

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34. 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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35. 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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36. 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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37. 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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38. The materials which exhibit the same elasticproperties in all directions are called

1. homogeneous

2. inelastic

3. isotropic

4. isentropic

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39. 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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40. 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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41. 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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42. 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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43. 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

1. 4 tonnes/cm2

2. 8 tonnes/cm2

3. 16 tonnes/cm2

4. 22 tonnes/cm2

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

1. double

2. one-fourth

3. half

4. same amount

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

1. area at the time of fracture

2. original cross-sectional area

3. average of a and b

4. minimum area after fracture

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

1. same

2. more

3. less

4. unpredictable.

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47. A thin mild steel wire is loaded by adding loads in equalincrements till it breaks. The extensions noted withincreasing loads will behave as under

1. uniform throughout

2. increase uniformly

3. first increase and then decrease

4. increase uniformly first and then increase rapidly

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

1. ideal materials

2. uniform materials

3. isotropic materials

4. paractical materials

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49. Young’s modulus is defined as the ratio of

1. volumetric stress and volumetric strain

2. lateral stress and lateral strain

3. longitudinal stress and longitudinal strain

4. shear stress to shear strain

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50. Strain is defined as the ratio of

1. change in volume to original volume

2. change in length to original length

3. change in cross-sectional area to original cross-sectional area

4. any one of the above

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