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Saturday, 1 October 2016

Elements of mechanical engineering-model question paper for B.Tech/B.E



1(a) Write the advantages and disadvantages of gaseous fuels over liquid fuels. (04 Marks)
(b) Using a neat figure, explain the principle of operation of hydroelectric power plant. (08 Marks)
(c) Write a note on classification of hydraulic turbines. (04 Marks)
(d) Define radial flow and axial flow. (04 Marks)
2 (a) Mention the differences between petrol engine and diesel engine. (04 Marks)
(b) What is a V-engine? Explain. (03 Marks)
(c) With a neat sketch, explain the working of a 4-stroke diesel engine with PV diagram. (06 Marks)
(d) A single cylinder 4-stroke engine runs at 1000 rpm has a bore of 115 mm and has a stroke of 140mm. The brake load is 6 kg at 600 mm radius and the mechanical efficiency is 80%. Calculate the brake power and the mean effective pressure. (07 Marks)
3(a) What is automation? Explain the types of automation. (06 Marks)
(b) Explain the advantages, disadvantages and applications of NC machine. (06 Marks)
(c) Explain the terms counter boring and counter sinking. (04 Marks)
(d) What do you mean by taper turning? With a neat sketch explain paper turning by swiveling the compound tool rest. (04 Marks)
4 (a) Explain (i) Slot milling (ii) Angular milling and (iii) End milling.  (06 Marks)
(b) What are the advantages, disadvantages and applications of robotics? (09 Marks)
(c) Explain the robotic application in space research. (05 marks)
5(a) Write down the classification of non-ferrous materials with examples. (07 Marks)
(b) Define a composite material. How composites are classified? (07 Marks)
(c) Write the applications of composite material in automobile industry. (05 Marks)
6 (a) Define the terms ton of refrigeration and co-efficient of performance. (04 Marks)
(b) What is the principle of refrigeration? Name the essential parts of refrigerator and briefly explain their functions. (08 Marks)
(c) Explain the different types of refrigerants and their uses. (08 Marks)
7 (a) Write a note on desirable chemical properties of a good refrigerant. (06 Marks)
(b) Write a note on use of rare-earth based materials on refrigeration. (06 Marks)
(c) Explain vapour absorption refrigeration system. (08 Marks)
8(a) With a neat sketch, explain the construction and working of a room air conditioner. Mention its merits and demerits. (08 Marks)
(b) Explain VCR and VAR systems. (08 Marks)
(c) Explain the biomedical application of air conditioning. (04 Marks)

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