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Machine Design Quiz Questions Test1

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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