Test 4 - Stresses

7/28/2019 Test 4 - Stresses

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Test 4 - Stresses Test 4 - Stresses

1. In a specification schedule is used when the pipe specified as schedule 80,the pipe corresponds to the

A. extra standard weight B. allowable stressC. internal pressure D. old standard weight2. The modulus of elasticity for ordinary steel usually falls between _____ million

pounds per square inch.A. 26 to 28 B. 28 to 31C. 20 to 45 D. 50 to 303. The modulus of elasticity is the measure ofA. accuracy B. qualityC. stiffness D. rigidity4. The modulus of elasticity for most material in compression is usually taken as

that in

A. tension B. bearingC. torsion D. yield5. The ratio of moment and stress is called:A. contraction B. proportional constantC. section modulus D. strain6. For a symmetrical cross-section beam the flexural stress is _____ when the

vertical shear is maximum.

A. infinity B. maximumC. minimum D. zero7. When tested in compression, ductile materials usually exhibit _____

characteristics up to the yield strength as they do when tested in tension.

A. the same B. less thanC. more than D. approximately the same8. It has been said that 80% of the failure of machine parts have been due toA. compression B. fatigue failuresC. negligence D. torsion9. Cazand quotes values for steel showing Sn/Su ratios, often called endurance

ratio, from

A. 0.23 to 0.65 B. 0.34 to 0.65C. 0.34 to 0.87 D. 0.63 to 0.93

10. The discontinuity or change of section, such as scratches holes, bends, orgrooves is a

A. stress caiser B. stress functioningC. stress raiser D. stress relieving11. The degree of stress concentration is usually indicated by theA. power factor B. stress concentration factorC. service factor D. stress factor12. In a part of uniform temperature and not acted upon by an external load, any

internal stress that exist is called

A. Control stress B. Form stressC. Residual stress D. Superposed stress13. The stress or load induced by the tightening operationA. Initial stress B. Initial tensionC. Residual stress D. None of these14. A type of failure due to instability is known asA. Slenderness ratio B. BuckinghamC. Buckling D. Stability15. The ratio of the length of the column and the radius of gyration of the cross-

sectional area about a centroidal axis is called

A. Contact ratio B. Constant ratioC. Power factor D. Slenderness ratio16. Formula that applies to a very slender column is calledA. Column formula B. Eulers formulaC. Moment formula D. Slender formula17. If two principal stresses are zero, the state stress isA. biaxial B. monoaxialC. triaxial D. uniaxial18. If one principal stress is zero, the state stress isA. biaxial B. monoaxialC. triaxial D. uniaxial19. If all the principal stresses have finite values, the system isA. biaxial B. monoaxialC. triaxial D. uniaxial


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20. Under theories of failure for static loading of ductile material, the design stressis the

A. endurance stress / factor of safetyB. factor of safety / yield stressC. yield stress / factor of safetyD. ultimate stress / factor of safety21. Under theories of failure, the value of shear stress is ______ that of tensile

stress

A. equal B. doubleC. half D. three times22. The theory of mechanics of materials shows that the results from the octahe

shear stress theory and those from the maximum distortion energy theory are

_______.

A. more than B. less thanC. relevant D. the same23. A kind of stress that is caused by forces acting along or parallel to the area is

called

A. Bearing stress B. Shearing stressC. Tangential stress D. Tensile stress24. Obtained by dividing the differential load dF by dA over which it acts.A. Elesticity B. ElongationC. Strain D. Stress25. The highest ordinate in the stressstrain diagram or curve is calledA. Elastic limit B. Rapture strengthC.

Ultimate strength D.

Yield point

26. A pair of forces equal in magnitude opposite in direction, and not in the sameline is called

A. couple B. momentumC. parallel forces D. torque27. Framework composed of members joined at their ends to form a rigid structure

is known as:

A. Joists B. MachineC. Purlins D. Truss28.

The ratio of the tensile stress to the tensile stress is called

A. Bulk modulus B. Hookes law

C. Shear modulus D. Young modulus29. The ratio of the volume stress to the volume strain is called the coefficient of

volume elasticity or

A. Bulk modulus B. Hookes lawC. Shear modulus D. Young modulus30. The action of the force is characterized byA. its magnitude B. direction of its actionC. point of application D. all of the above31. At highest or lowest point on the moment diagramA. shear is half, the maximum momentB. shear is maximumC. shear is negativeD. shear is zero32. The built-in or fixed support is capable of supportingA. an axial load B. a traverse focusC. a bending moment D. all of these33. The modulus of elasticity in shear is commonly calledA. bulk modulus B. deformationC. modulus of rigidity D. young modulus34. The stress beyond where the material will not return to its original shape when

unloaded, but will retain a permanent deformation is termed as

A. elastic limit B. proportional limitC. yield point E. all of the above35. Refers to the actual stress the material has when under loadA. Allowable stress B. Factor of safetyC. Ultimate strength D. Working stress36. The safe soil bearing pressure of diesel engine is aboutA. 2000 kg per sq cm B. 4600 kg per sq cmC. 4890 kg per sq cm D. 5833 kg per sq cm37. The machine foundation must have a factor of safety ofA. 3 B. 4C. 5 D. 6


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38. The load acts over a smaller area, and the ______ continuous to increase unitfailure

A. actual stress B. allowable stressC. compressive stress D. tensile stress39. In the stressstrain diagram where there is a large increase in strain with little

or no increase in stress is called:

A. endurance strength B. ultimate strengthC. rapture strength D. yield strength40. A _______ that carries load traverse to its axis.A. structure B. columnC. beam D. frame41. Which type of load that i s applied slowly and is never removed?A. Uniform load B. Static loadC. Equilibrium load D. Impact load42. When varying loads are applied that are not regular in their amplitude, the

loading is called

A. Repeated loading B. Random loadingC. Reversed loading D. Fluctuating loading43. A measure of the relative safety of a load carrying component is termedA. design factor B. load factorC. ratio factor D. demand factor44. The condition which causes actual stresses in machine members to be higher

than normal values predicted by the elementary direct and combined stress

equations.

A. Stress concentration factor B. Stress factorC. Design factor D. Load factor45. The stress value, which is used in the mathematical determination of the

required size of the machine member.

A. Endurance stress B. Design stressC. Maximum stress D. Normal stress46. Typical values for Poissons ratio ofcast iron is in the range ofA. 0.30 to 0.33 B. 0.27 to 0.30C. 0.25 to 0.27 D. 0.35 to 0.45

47. Typical values for Poissons ratio of cast iron is in the range ofA. 0.30 to 0.33 B. 0.27 to 0.30C. 0.25 to 0.27 D. 0.35 to 0.4548. Typical values for Poissons ratio of aluminum and titanium is in the range ofA. 0.25 to 0.27 B. 0.27 to 0.30C. 0.30 to 0.33 D. 0.35 to 0.4549. The angle of inclination of the plane on which the principal stresses act is

called

A. normal plane B. principal plane C.D. tangential plane E. traverse plane F.50. _______ provides a very accurate prediction of failure of ductile materials

under static loads or completely reversed normal, shear or combined stresses.

A. Shear stress theory B. Normal stress theoryC. Distortion energy theory D. Soderberg line theory

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Test 4 - Stresses