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Mechanical Engineering Objective Questions { Machine Design }



29. In nitrided parts, the origins of the fatigue cracks will occur at
A.Surface
B.Within the core
C.Could occur anywhere
D.None of the above

30. Which process will increase the fatigue duration of parts?
A.Finishing and polishing
B.Shot-peening
C.Decarburisation
D.Electroplating

31. Which is correct statement?
A.A member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron
B.A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
C.Both will be equally rigid
D.Which one is rigid will depend on several other factors

32. Resistance to fatigue of a material is measured by
A.Young's modulus
B.Endurance limit
C.Elastic limit
D.Ultimate tensile strength

33. In most machine members, the damping capacity of the material should be
A.Low
B.Zero
C.High
D.Could be anything

34. For steel, the ultimate strength in shear as compared to ultimate strength in tension is
A.Same
B.3-Feb
C.1/3
D.1/4

35. The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of
A.0.25
B.0.55
C.0.65
D.0.75

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