Q. When equal and opposite forces applied to a body, tend to elongate it, the stress so produced, is called ____________

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Q. Which of the following stresses are associated with the tightening of a nut on a bolt?

P. Tensile stress due to the streching of bolt
Q. Bending stress due to the bending of bolt
R. Torsional shear stress due to frictional resistance between the nut and the bolt

Select the correct answer using the codes given below.

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Q. In a tensile test, near the elastic limit zone ____________

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Q. The phenomenon of slow growth of strain under a steady tensile stress is called ____________

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Q. A rod 150cm long and of diameter 2cm is subjected to an axial pull of 20kN. What will be the stress?

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Q. The stress in a rod is 70 N/mm² and the modulus of elasticity is 2 x 10⁵ N/mm². what will be the strain in the rod?

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Q. What will be the minimum diameter of a steel wire, which is used to raise a load of 4000N if the stress in the rod is not to exceed 95 MN/m²?

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Q. A tensile test was conducted on mild steel bar. The load at elastic limit was 250kN and the diameter of the steel bar was 3cm. What will be the value of stress?

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Q. For keeping the stress wholly compressive the load may be applied on a circular column anywhere within a concentric circle of diameter _____________

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Q. Consider two bars A and B of same material tightly secured between two unyielding walls. Coefficient of thermal expansion of bar A is more than that of B. What are the stresses induced on increasing the temperature?

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Q. What will be the unit of compressive stress?

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Q. A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be 3 times the maximum tensile stress, centre of gravity of the section from flange side is ____________

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Q. A solid circular shaft of diameter d is subjected to a torque T. the maximum normal stress induced in the shaft is ____________

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Q. When a rectangular beam is loaded transversely, the maximum compressive stress develops on ____________

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Q. An axial residual compressive stress due to a manufacturing process is present on the outer surface of a rotating shaft subjected to bending. Under a given bending load, the fatigue of the shaft in the presence of the residual compressive stress is ____________

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Q. A steel bar of 40mm x 40mm square cross-section is subjected to an axial compressive load of 200kN. If the length of the bar is 2m and E=200GPa, the elongation of the bar well be ____________

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Q. The length, Young’s modulus and coefficient of thermal expansion of bar P are twice that of bar Q. what will be the ration of stress developed in bar P to that in bar Q if the temperature of both bars is increased by the same amount?

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Q. A steel bar 600mm long and having 30mm diameter, is turned down to 25mm diameter for one fourth of its length. It is heated at 30 C above room temperature, clamped at both ends and then allowed to cool to room temperature. If the distance between the clamps is unchanged, the maximum stress in the bar ( α = 12.5 x 10⁻⁶ per C and E = 200 GN/m²) is

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Q. A cube having each side of length p, is constrained in all directions and is heated unigormly so that the temperature is raised to T.C. What will be the stress developed in the cube?

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Q. A steel rod 10mm in diameter and 1m long is heated from 20 to 100 degree celcius, E = 200 GPa and coefficient of thermal expansion is 12 x10⁻⁶ per degree celcius. Calculate the thermal stress developed?

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