Mechanical Engineering
Q1 a.Why an engineer has to draw shear force diagram and bending moment diagram for a beam. Provide a sketch for above explanation. (0.5 Marks)
Q1 b. Draw a simply supported beam with roller support. Mark the type of loads that can be applied on the beam and its reactions. (0.5 Marks)
Q2.An axial pull of 65000 N is acting on a bar consisting of three lengths as shown in figure below. Take the Young’s modulus of section 1 and section 3 as , and of section 2 as
Q3.An electric motor is connected to a turbine with the help of a hollow shaft. The hollow shaft has an internal diameter that is of its external diameter and transmits power at 120 r.p.m. Determine the minimum external diameter of the shaft if the shear stress is not to exceed 5500 and the twist in a length of 1.6 m should not exceed 1.5 degrees. Assume maximum torque = 1.2 mean torque and modulus of rigidity .
Q4. A composite platform AB 12 m long is used as a diving board in swimming pool. There are swimmers waiting on the board exerting a load of 35 N/m for full length of the board at equal interval of 1 m. While diving from the tip of the board a swimmer exert a load of 125 kN at the tip of the diving board when they jump into swimming pool. Convert this into an engineering problem to calculate the shear force and bending moment developed in the composite platform. Explain about type of beam and its support you will consider. Support your answer with drawing. Draw shear force and bending moment diagram as per your calculations.
