FAQ’s from Strength of Materials

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1. In ideal 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 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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3. 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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4. The C.G. of a right circular solid cone of height h liesat the following distance from the base

1. h/2

2. J/3

3. h/6

4. h/4

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5. 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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6. 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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7. 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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8. Coulomb friction is the friction between

1. bodies having relative motion

2. two dry surfaces

3. two lubricated surfaces

4. solids and liquids

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9. 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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10. 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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11. Shear stress induced in a shaft subjected to tensionwill be

1. maximum at periphery and zero at center

2. maximum at center

3. uniform throughout

4. none of the above

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12. 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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13. 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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14. 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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15. 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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16. 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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17. 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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18. Rivets are made of following type of material

1. tough

2. hard

3. resilient

4. ductile

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19. 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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20. When two plates are butt together and riveted withcover plates with two rows of rivets, the joi;it is known as

1. lap point

2. butt joint

3. single riveted single cover butt joint

4. double riveted double cover butt joint

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21. The distance between the centres of the rivets inadjacent rows of zig-zag riveted joint is known as

1. pitch

2. back pitch

3. diagonal pitch

4. diametral pitch

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22. 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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23. 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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24. 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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25. Proof resilience per material is known as

1. resilience

2. proof resilience

3. modulus of resilience

4. toughness

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

1. resilience

2. proof resilience

3. modulus of resilience

4. toughness

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27. Flow stress corresponds to

1. fluids in motion

2. breaking point

3. plastic deformation of solids

4. rupture stress

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28. 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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29. 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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30. The ratio of direct stress to volumetric strain in caseof a body subjected to three mutually perpendicularstresses of equal intensity, is equal to

1. Young’s modulus

2. bulk modulus

3. modulus of rigidity

4. modulus of elasticity

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31. 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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32. 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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33. 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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34. 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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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. Poisson’s ratio is defined as the ratio of

1. longitudinal stress and longitudinal strain

2. longitudinal stress and lateral stress

3. lateral stress and longitudinal stress

4. lateral stress and lateral strain

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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. Which of the following materials is most elastic

1. rubber

2. plastic

3. brass

4. glass.

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40. 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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41. 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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42. Which of the following has no unit

1. kinematic viscosity

2. surface tension

3. bulk modulus

4. strain

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43. For steel, the ultimate strength in shear as comparedto in tension is nearly

1. same

2. half

3. one-third

4. two-third

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44. 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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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 ultimate tensile stress of mild steel compared toultimate compressive stress is

1. same

2. more

3. less

4. unpredictable.

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48. Modulus of rigidity is defined as the ratio of

1. longitudinal stress and longitudinal strain

2. volumetric stress and volumetric strain

3. lateral stress and lateral strain

4. shear stress and shear strain

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

1. strain

2. lateral strain

3. linear strain

4. linear stress

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50. The unit of Young’s modulus is

1. mm/mm

2. kg/cm

3. kg

4. kg/cm2

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