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Mechanical Engineering Objective Questions { Machine Design }

22. In testing a material for endurance strength, it is subjected to
A.Static load
B.Impact load
C.Static as well as dynamic load
D.Completely reversed load

23. If a material fails below its yield point, failure would be due to
D.Sudden loading

24. The fatigue limit of a material
A.Is greatly decreased by poor surface conditions
B.Remains same irrespective of surface conditions
C.Depends mainly on core composition is dependent upon yield strength of material
D.None of the above

25. Cold working
A.Increases the fatigue strength
B.Decreases the fatigue strength
C.Has no influence on fatigue strength
D.Alone has no influence on fatigue strength

26. Yield point in fatigue loading as compared to static loading is
D.Depends on other factors

27. Residual stress in materials
A.Acts when external load is applied
B.Becomes zero when external load is removed
C.Is independent of external loads
D.Is always harmful

28. The building up of worn and undersized parts, subjected to repeated loads by electroplating is
A.Best method
B.Extremely hazardous
C.Has no effect as regards fatigue strength
D.Cheapest method

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