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    Mechanical Engineering : Machine Design Question & Answer in English

Failure of a material is called fatigue when it fails
A.  At the elastic limit
B.  Below the elastic limit
C.  At the yield point
D.  Below the yield point

When a material is subjected to fatigue loading, the ratio of the endurance limit to ultimate tensile strength is
A.  0.20
B.  0.35
C.  0.50
D.  0.65

The ratio of endurance limit in shear to the endurance limit in flexure is
A.  0.25
B.  0.40
C.  0.55
D.  0.70

The surface finish factor for a mirror polished is
A.  0.45
B.  0.65
C.  0.85
D.  1

The design of the pressure vessel is based on
A.  Longitudinal stress
B.  Hoop stress
C.  Longitudinal & hoop stress
D.  None of these

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