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Sunday, 8 February 2015

Product design and manufacturing- Model question paper for B.E/B.Tech Mechanical Engineering



1(a) ‘Design is an iterative process’. Explain the statement in the light of Asimow’s model. (6 Marks)
(b) What is a product message? How are lightness, speed, stability conveyed in products? Illustrate through examples. (6 Marks)
(c) How is toughened glass pre-stressed to make it impact resistant and stronger in bending? (4 Marks)
(d) What is a balanced design? Why is the material of a worm wheel selected as brass while for a worm, steel is used? (4 Marks)
2(a) How provision of ribs increases the stiffness and strength of a plate? (4 Marks)
(b) What is a Michael stainfield? How is this concept utilized in designing a Nylon gear? (6 Marks)
(c) Differentiate between hot chamber and cold chamber die casting processes. (6 Marks)
(d) Explain the utility of Merchant’s circle diagram. (4 Marks)
3(a) Powder metallurgy can produce only prismatic shapes. How to achieve complex shapes by powder metallurgical process. (4 Marks)
(b) Why bosses are avoided in flat die forging? (4 Marks)
(c) Describe injection moulding and dipping method of production of rubber products. What is reaction injection moulding? (6 Marks)
(d) Write a note on special considerations for design of glass parts. (6 Marks)
4(a) What is a break-even chart? How does it help in arriving at profit or loss corresponding to a certain quantity of production? (5 Marks)
(b) How environmental factors such as noise can be taken care of to ensure worker efficiency? (4 Marks)
(c) How is ergonomics applied to displays and controls? Give a list of controls and displays used in ergonomics. (6 Marks)
(d) A strut is subjected to a tensile force of P 20 kN. The value of σt = 100 N/mm2. If the material cost is Rupees 30 per kilogram and the metal cutting cost per surface is Rupees 10 per mm2, calculate the section dimensions for cost minimization. The strut length is 800 mm. Assume the density of the material ρ = 8000 kg/m3. (5 Marks)
5(a) What is a value? Write a note on the value analysis job plan. (6 Marks)
(b) Mention the ground rules for creative techniques. (4 Marks)
(c) How is a multivariable chart used? How does it help in material-process selection? (4 Marks)
(d) Explain functional analysis system technique diagrams. Illustrate with an example. (6 Marks)
6(a) How is feasibility analysis facilitated using computer? (4 Marks)
(b) What is DBMS in computer integrated manufacturing? What is adaptive ability for a good database? (6 Marks)
(c) What is quality function deployment? (4 Marks)
(d) What is meant by rapid prototyping? What are different methods of rapid prototyping? (6 Marks)
7(a) Develop expression for reliability of systems in series and parallel. (6 Marks)
(b) What are chance causes of variation and assignable causes of variation in a process? What are trial control limits and stable control limits of a process. (4 Marks)
(c) What is fault tree analysis? Make a logic diagram for inability of an engine to start. (6 Marks)
(d) A computer has two CPUs working in parallel. The failure rate of a single CPU is 0.005 failures per hour. Calculate MTTF. (4 Marks)
8(a) What is the aim of business analysis? How is economic commercial value determined? (6 Marks)
(b) What is the role of critical path analysis in a launch project? (4 Marks)
(c) Compare the green score index of automobiles of the past and present. (4 Marks)
(d) How is a products stage determined in a product life cycle if the sales data in year 1 and year 2 is known and the standard deviation σ of the sales is known? If the sales of a product in year 1 are 400 and in year 2 is 370, predict the stage where the product is of standard deviation 40 units. (6 Marks)

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