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

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belasticity

✓


cductility

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dmalleability

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View Answer elasticity

The buckling load for a given material depends on___________________?


aslenderness ratio and area of cross-section

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bPoisson’s ratio and modulus of elasticity

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cslenderness ratio and modulus of elasticity

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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

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b2.1 X 106 kg/cm2

✓


c2.1 x 107 kg/cm2

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d0.1 xlO6 kg/cm2 (

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View Answer 2.1 X 106 kg/cm2

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


aprincipal stress

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btensile stress

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ccompressive stress

✓


dshear stress

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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

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cIt gives, a more accurate picture of the ductility

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

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View Answer It does not exist

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


asame

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bhalf

✓


cone-third

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dtwo-third

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View Answer half

True stress-strain curve for materials is plotted between__________________?


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

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bload/instantaneous cross-sectional area original area and log

✓


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

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dload/instantaneous area and instantaneous area/original area

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


a50%

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b25%

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c0%

✓


d15%

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View Answer 0%

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


atoughness

✓


btensile strength

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ccapability of being cold worked

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dhardness

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View Answer toughness

Strain is defined as the ratio of__________________?


achange in volume to original volume

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bchange in length to original length

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

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dany one of the above

✓


View Answer any one of the above

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