Mechanical Engineering MCQs

Page No. 96

The fatigue limit of a material____________________?


ais greatly decreased by poor surface conditions


bremains same irrespective of surface conditions


cdepends mainly on core composition


dis dependent upon yield strength of material



The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?


a1 : l


b2:1


c3 : 2


d2 : 3


View Answer 3 : 2

The permissible stress for carbon steel under static loading is generally taken as__________________?


a2000-3000 kg/pm2


b3000-4000 kg/cm2


c4000-4500 kg/cm2


d7500-10,000 kg/cm2


View Answer 4000-4500 kg/cm2

A hot short metal is_________________?


abrittle when cold


bbrittle when hot


cbrittle under all conditions


dductile at high temperature


View Answer brittle when hot

Rankine’s theory of failure is applicable for following type of materials___________________?


abrittle


bductile


celastic


dplastic


View Answer brittle

Tensile strength of a mild steel specimen can be roughly predicted from following hardness test_________________?


aBrinell


bRockwell


cVicker


dShore’s sceleroscope


View Answer Brinell

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_________________?


adecreasing the cross-section area of’ bar


bincreasing the cross-section area of bar


cremain unaffected with cross-section area


dwould depend upon other factors



If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?


abe independent of ratio of mass of load W to mass of bar (y)


bincrease with increase in y


cdecrease with decrease in y


ddepend on other considerations



Stress concentration is caused due to_____________________?


avariation in properties of material from point to point in a member


bpitting at’points or areas at which loads on a member are applied


cabrupt change of section


dall of the above


View Answer all of the above

Plastic flow in ductile materials_____________________?


aincreases the seriousness of static load-ing stress concentration


blessens the seriousness of static load¬ing stress concentration


chas no effect on it


ddepends on other considerations



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