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JNTU previous question papers 2-1 mechanical |

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Re: JNTU previous question papers 2-1 mechanical
here I am giving you papers name of B tech 2nd year 1st semester for the mechanical engineering course offered by the JNTU below : B tech 2nd year 1st MECHANICS OF SOLIDS 1. (a) Derive relation between three elastic moduli [8] (b) Draw stress - strain diagram for mild steel. Indicate salient points and define them. [8] 2. A hollow cylinder of internal and external diameters of 12.5 cm and 25 cm and a length of 50 cm is stressed to 840 N/mm2 by an axial load. The modulus of Elasticity of the material is 2×105N/mm2, while its Poisson’s ratio is 0.25. Find the change in [16] (a) its internal dimensions (b) change of internal volume and (c) the proportional change in its density. 3. (a) Device the relations among loading, shear force and bending moment in a beam. [9] (b) A cantilever beam AB span 6m is subjected to a uniformly varying load of 8 kN/m intensity at the fixed end A and zero at the free end B. draw SFD and BMD. [7] 4. (a) Discuss the assumptions involved in the theory of simple bending. [6] (b) The cross section of a simply supported beam is as shown in Figure 4(b)iii. Find its moment of resistance if permissible tensile stress is 160MPa. Compare it with equivalent section of same area but [10] i. Square section ii. Rectangular section with twice the width and iii. a circular section. 5. (a) A beam of length L is supported at each end with a couple applied at an intermediate point. Deduce an expression for the deflection and hence calculate the deflection at the point of application of the moment. [8] (b) A beam of length L carries a uniformly distributed load w/unit length and rests on three supports, two at the ends and one in the middle. Find how much the middle support be lower than the end ones in order that the pressures on the three supports shall be equal. [8] 7. (a) Derive an expression for the stresses on an oblique section of a rectangular body, when it is subjected to a direct stress in one plane only . [6] (b) The principal stresses at a point in a member subjected to two dimensional stress are 120 N/mm2 and 50 N/mm2 tensile. Find the plane on which the resultant stress has maximum obliquity and magnitude of this obliquity. [10] 8. A propeller shaft, 160mm external diameter, 80mm internal diameter, transmits 450kW at 4/3 Hz. There is, at the same time, a bending moment of 30kN-m and an end thrust of 250kN. Find [16] (a) the maximum principal stresses and their planes (b) the maximum shear stress and its plane for the complete question paper I am attaching a link with it .. jwfiles.net/cgi-bin/dl.cgi/h5puma7bp55zhobqu2tfqz72zcnmjsrpsm45spkg74/2-1_NR_May_2009.rar |