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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