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Mechanical Engineering Objective Questions { Machine Design }

8. If the longitudinal strain in a material is doubled in comparison to lateral strain, then ratio of modulus of rigidity to elasticity will be

9. If a load W is applied instantaneously on a bar; then the stress induced in bar will
A.Be independent of ratio of mass of load W to mass of bar (?)
B.Increase with increase in ?
C.Decrease with decrease in ?
D.Depend on other considerations

10. Brittle coating technique is used for
A.Determining brittleness
B.Protecting metal against corrosion
C.Protecting metal against wear and tear
D.Experimental stress analysis

11. Stress concentration is caused due to
A.Variation in properties of material from point to point in a member
B.Pitting at points or areas at which loads on a member are applied
C.Abrupt change of section
D.All of the above

12. The endurance limit of a material with finished surface in comparison to rough surface is
D.More or less depending on quantum of load

13. Plastic flow in ductile materials
A.Increases the seriousness of static loading stress concentration
B.Lessens the seriousness of static loading stress concentration
C.Has no effect on it
D.Depends on other considerations

14. Stress concentration in static loading is more serious in
A.Ductile materials
B.Brittle materials
C.Equally serious in both cases
D.Depends on other factors

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