Related Questions

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.
A Working
B Damaging
C Allowable
D None of these
The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.
A Shear
B Tensile
C Compressive
D Thermal
The length of the lap in a compression member is kept greater than bar diameter x (Permissible stress in bar / Five times the bond stress) or
A 12 bar diameters
B 18 bar diameters
C 24 bar diameters
D 30 bar diameters
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be
A Same in both cases
B 2 times more
C 3 times more
D 4 times more
Thermal conductivity of a material does not depend upon its
A Mass
B Volume
C Surface area
D All of the above
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is $$\tau $$. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
A $$\frac{\tau }{2}$$
B $$\tau $$
C $$2\tau $$
D $$4\tau $$
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 $$\frac{{{\text{w}}{l^4}}}{{2{\text{E}}}}$$
If a load W is applied instantaneously on a bar; Then the stress induced in bar will
A Be independent of ratio of mass of load W to mass of bar (y)
B Increase with increase in y
C Decrease with decrease in y
D Depend on other considerations
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be
A $$\frac{{\text{W}}}{{\text{A}}}$$
B $$\frac{{\text{W}}}{{2{\text{A}}}}$$
C $$\frac{{2{\text{W}}}}{{\text{A}}}$$
D $$\frac{{3{\text{W}}}}{{\text{A}}}$$
When a bar is subjected to a change of temperature and its deformation is prevented, the stress induced in the bar is
A Tensile stress
B Compressive stress
C Shear stress
D Thermal stress

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