Related Questions

A tensile test is performed on a mild steel round bar. Its diameter after fracture will
A Remain same
B Increase
C Decrease
D Depend upon rate of loading
A simply supported uniform rectangular bar breadth b, depth d and length L carries an isolated load W at its mid-span. The same bar experiences an extension e under same tensile load. The ratio of the maximum deflection to the elongation, is
A $$\frac{{\text{L}}}{{\text{d}}}$$
B $$\frac{{\text{L}}}{{2{\text{d}}}}$$
C $${\left( {\frac{{\text{L}}}{{2{\text{d}}}}} \right)^2}$$
D $${\left( {\frac{{\text{L}}}{{3{\text{d}}}}} \right)^2}$$
When a bar of length '$$l$$' and diameter 'd' is rigidly fixed at the upper end and hanging freely, then the total elongation produced in the bar due to its own weight is (where w = Weight per unit volume of the bar)
A $$\frac{{{\text{w}}l}}{{2{\text{E}}}}$$
B $$\frac{{{\text{w}}{l^2}}}{{2{\text{E}}}}$$
C $$\frac{{{\text{w}}{l^3}}}{{2{\text{E}}}}$$
D $$\frac{{{\text{w}}{l^4}}}{{2{\text{E}}}}$$
In a tensile test, when the material is stressed beyond elastic limit, the tensile strain __________ as compared to the stress.
A Decreases slowly
B Increases slowly
C Decreases more quickly
D Increases more quickly
A bar L metre long and having its area of cross-section A, is subjected to a gradually applied tensile load W. The strain energy stored in the bar is
A $$\frac{{{\text{WL}}}}{{2{\text{AE}}}}$$
B $$\frac{{{\text{WL}}}}{{{\text{AE}}}}$$
C $$\frac{{{{\text{W}}^2}{\text{L}}}}{{{\text{AE}}}}$$
D $$\frac{{{{\text{W}}^2}{\text{L}}}}{{2{\text{AE}}}}$$
The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
A $$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$
B $$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$
C $$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$
D $$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$
The length of a conical bar is $$l$$, diameter of base is d and weight per unit volume is w. It is fixes at its upper end and hanging freely. The elongation of the bar under the action of its own weight will be
A $$\frac{{{\text{w}}{l^2}}}{{2{\text{E}}}}$$
B $$\frac{{{\text{w}}{l^2}}}{{4{\text{E}}}}$$
C $$\frac{{{\text{w}}{l^2}}}{{6{\text{E}}}}$$
D $$\frac{{{\text{w}}{l^2}}}{{8{\text{E}}}}$$
In a tensile test on mild steel specimen, the breaking stress as compared to ultimate tensile stress is
A More
B Less
C Same
D More/less depending on composition
Two closely-coiled helical springs 'A' and 'B' of the same material, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be
A $$\frac{1}{8}$$
B $$\frac{1}{4}$$
C 2
D 4
3/8 of all applicants for a job are male. 3/4 of all applicants are rejected in the first round including 2/3 of all male applicants. What fraction of applicants remaining after the first round are male?
A 1/2
B 1/4
C 2/9
D None

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