Mechanical Engineering MCQs

Page No. 129

If the radius of wire stretched by a load is doubled, then its Young’s modulus will be_______________?


adoubled


bhalved


cbecome four times


dremain unaffected


View Answer remain unaffected

Tensile strength of a material is obtained by dividing the maximum load during the test by the_________________?


aarea at the time of fracture


boriginal cross-sectional area


caverage of A. and B.


dminimum area after fracture



The Young’s modulus of a wire is defined as the stress which will increase the length of wire compared to its original length________________?


ahalf


bsame amount


cdouble


done-fourth


View Answer same amount

The intensity of stress which causes unit strain is called_______________?


aunit stress


bbulk modulus


cmodulus of rigidity


dmodulus of elasticity


View Answer modulus of elasticity

During a tensile test on a specimen of 1 cm cross-section, maximum load observed was 8 tonnes and area of cross-section at neck was 0.5 cm2. Ultimate tensile strength of specimen is___________________?


a4 tonnes/cm2


b8 tonnes/cm2


c16 tonnes/cm2


d22 tonnes/cm2


View Answer 8 tonnes/cm2

Which of the following has no unit __________________?


akinematic viscosity


bsurface tension


cbulk modulus


dstrain


View Answer strain

In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is_________________?


amore


bless


csame


dmore/less depending on composition


View Answer less

Which of the following materials is most elastic_________________?


arubber


bplastic


cbrass


dsteel


View Answer steel

The value of Poisson’s ratio for steel is between_________________?


a0.01 to 0.1


b0.23 to 0.27


c0.25 to 0.33


d0.4 to 0.6


View Answer 0.25 to 0.33

The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight________________?


aof same magnitude as that of bar and applied at the lower end


bhalf the weight of bar applied at lower end


chalf of the square of weight of bar applied at lower end


done-fourth of weight of bar applied at lower end



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