Machine Design 2018 Question Paper — Government College of Engineerin…

The 2018 Machine Design previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.

Instructions

Q1. What is the significance of materials in a design process? Briefly discuss the stress strain diagram for ductile and brittle materials from design perspective. [20 marks]
Q2. (a) Discuss the significance of standards and codes in design process. Mention at least five standards used by designer in industries. (b) What is the role of designer in material selection for various machine elements? Explain with the help of an example. [20 marks]

Q3. (a) What do you understand by the term coupling? Discuss the applications of couplings as a machine element. (b) What is the function of a key? Discuss the types of stresses induced in keys. [20 marks]
Q4. A marine type flange coupling is required to transmit 2900 kW power at a speed of 100 rpm. The flanges are connected by 8 taper bolts having an allowable shear stress of $60\text{ N/mm}^2$. Assume various suitable data and design and coupling. Also give a list of various design parameters for this coupling. [20 marks]

Q5. (a) What are the advantages of flat belt drives? Explain the role of slip in design of belt drive systems. (b) As a design engineer, if you are to select a suitable design alternative from a list of belt, gear and chain drive for power transmission, which design alternative you will prefer? Give the order of your preference. Also justify your answer in the form of a comment in each alternative under consideration. [20 marks]
Q6. Design a V - belt drive system for a 5 kW normal torque motor, which operates at 1440 rpm with a light duty compressor operating at 970 rpm. The compressor runs for 24 hours on daily basis. The centre distance is 500 mm. The pitch diameter of driving pulley is 150 mm. Design the belt and suggest parameters of rim and hub. [20 marks]

Q7. (a) What do you understand by the term bearing? Give a detailed classification of bearings. Draw free hand sketches of bearings which are used in various engineering applications. (b) Discuss the type of failure in a bearing. [20 marks]
Q8. A single row deep groove ball bearing is subjected to a radial load of 8 kN and a thrust load of 3 kN. The shaft rotates at 1200 rpm. The expected $L_{10}$ life of the bearing is 20000 hours. The minimum acceptable shaft diameter is 75 mm. Design this bearing and suggest the suitable bearing number. [20 marks]