Machine Design Quiz Questions Test1 New Document Thank you very much for taking test Test your caliber 1. The ultimate strength of steel in tension in comparison to shear is in the ratio of ____. 1 : 1 2 : 1 3 : 2 2 : 3 2. The pciTnissible stress for carbon steel under static loading is generally taken as _____. 2000-3000 kg/pm2 3000-4000 kg/cm2 4000-J500 kg/cm2 7500-10,000 kg/cm2 3. The property of a material which enables it to resist fracture due to high impact loads is known as _____. elasticity endurance strength toughness 4. A hot short metal is _____. brittle when cold brittle when hot brittle under all conditions ductile at high temperature 5. Guest's theory of failure is applicable for following type of materials _____. brittle ductile elastic plastic 6. Rankine's theory of failure is applicable for following type of materials brittle ductile elastic plastic 7. If an unsupported uniform cross sectional elastic bar is subjected to a longitudinal impact from a rigid bob moving with velocity v, then a compressive wave of intensity sc is propagated through the bar as follows vpE vVvF WpE/2 IvHpE 8. Tensile strength of a mild steel specimen can be roughly predicted from following hardness test Brinell Rockwell Vicker Shore's sceleroscope 9. Resilience of a material is important, when it is subjected to ____. combined loading fatigue thermal stresses shock loading 10. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by _____. decreasing the cross-section area of bar increasing the cross-section area of bar remain unaffected with cross-section area would depend upon other factors 11. If a load W is applied instantaneously on a bar; then the stress induced in bar will be independent of ratio of mass of load W to mass of bar (y) increase with increase in y decrease with decrease in y depend on other considerations 12. Brittle coating technique is used for _____. determining brittleness protecting metal against corrosion protecting metal against wear and tear experimental stress analysis 13. Stress concentration is caused due to ______. variation in properties of material from point to point in a member pitting at'points or areas at which loads on a member are applied abrupt change of section all of the above 14. The endurance limit of a material with finished surface in comparison to rough surface is _____. more less same more or less depending on quantum of load 15. Plastic flow in ductile materials increases the seriousness of static load-ing stress concentration lessens the seriousness of static load¬ing stress concentration has no effect on it depends on other considerations 16. The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be ____. same in both cases 2 times more 3 times more 4 times more 17. The fatigue life of a part can be improved by _____. electroplating polishing coating shot peening 18. Stress concentration in static loading is more serious in ductile materials brittle materials equally serious in both cases depends on other factors 19. Stress concentration in cyclic loading is more serious in ductile materials brittle materials equally serious in both cases depends on other factors 20. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to _____. dynamic loading static loading combined static and dynamic loading completely reversed loading
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