Mechanical Engineering MCQs

Page No. 136

The property of a material by virtue of which a body returns to its original, shape after removal of the load is called____________________?


aplasticity


belasticity


cductility


dmalleability


View Answer elasticity

The buckling load for a given material depends on___________________?


aslenderness ratio and area of cross-section


bPoisson’s ratio and modulus of elasticity


cslenderness ratio and modulus of elasticity


dslenderness ratio, area of cross-section and modulus of elasticity



The value of modulus of elasticity for mild steel is of the order of________________?


a2.1xl05 kg/cm2


b2.1 X 106 kg/cm2


c2.1 x 107 kg/cm2


d0.1 xlO6 kg/cm2 (


View Answer 2.1 X 106 kg/cm2

If a part is constrained to move and heated, it will develop ____________________?


aprincipal stress


btensile stress


ccompressive stress


dshear stress


View Answer compressive stress

Which is the false statement about true stress-strain method______________?


aIt does not exist


bIt is more sensitive to changes in both metallurgical and mechanical conditions


cIt gives, a more accurate picture of the ductility


dIt can be correlated with stress-strain values in other tests like torsion, impact, combined stress tests etc.


View Answer It does not exist

For steel, the ultimate strength in shear as compared to in tension is nearly _________________?


asame


bhalf


cone-third


dtwo-third


View Answer half

True stress-strain curve for materials is plotted between__________________?


aload/original cross-sectional area and change in length/original length


bload/instantaneous cross-sectional area original area and log


cload/instantaneous cross-sectional area and change in length/original length


dload/instantaneous area and instantaneous area/original area



Percentage reduction of area in performing tensile test on cast iron may be of the order of__________________?


a50%


b25%


c0%


d15%


View Answer 0%

The impact strength of a material is an index of its ___________________?


atoughness


btensile strength


ccapability of being cold worked


dhardness


View Answer toughness

Strain is defined as the ratio of__________________?


achange in volume to original volume


bchange in length to original length


cchange in cross-sectional area to original cross-sectional area


dany one of the above


View Answer any one of the above

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