Elements of Mechanical Engineering - Jun 2015

First Year Engineering (P Cycle) (Semester 1)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks. 1 (a) What are the advantages disadvantages of renewable and non renewable and non renewable energy sources?(5 marks) 1 (b) What is calorific value? Compare biofuels with petroleum fuels in terms of calorific value.(5 marks) 1 (c) Explain with neat sketch, working of Babcock and Wilcox boiler(10 marks) 10 (a) Define : i) Refrigeration effect ii) Unit of Refrigeration iii) COP of Refrigeration(6 marks) 10 (b) List the commonly used refrigerants(4 marks) 10 (c) Explain with neat sketch the principle of room air conditioner(10 marks) 2 (a) Explain briefly the principle of conversion of solar energy directly on to electrical energy in a solar cell(10 marks) 2 (b) Write a short note on wind energy and its conversion(10 marks) 3 (a) Differentiate between reaction and impulse turbines(5 marks) 3 (b) With neat sketch explain the working of Pelton wheel(10 marks) 3 (c) Differentiate between petrol engine and diesel engine(5 marks) 4 (a) With neat sketch explain working of 4 stroke diesel engine(10 marks) 4 (b) With neat sketch explain the working of closed cycle gas turbine(6 marks) 4 (c) Define : Thermal efficiency and mechanical efficiency of IC engine(4 marks) 5 (a) Name the various operation carried out on lathe. Explain taper turning by swivelling compound rest.(8 marks) 5 (b) What is milling? With neat sketch explain end milling and plane milling operation(6 marks) 5 (c) Differentiate between i) Counter sinking and counter boring ii) Reaming and Boring(6 marks) 6 (a) Define Robot, write the classification based on robot physical configuration, write down the applications of industrial robot(8 marks) 6 (b) What is automation ? Explain the types of automation with examples(7 marks) 6 (c) With block diagram explain basic components of NC system(5 marks) 7 (a) What are ferrous metal? Write a note on stainless steel. Write down its application(8 marks) 7 (b) Differentiate between ferrous and non ferrous materials(6 marks) 7 (c) What is soldering? Classify soldering process(6 marks) 8 (a) Define welding. Explain electric are welding process. Write down its demerits(8 marks) 8 (b) Differentiate between welding. Brazing and soldering(6 marks) 8 (c) Define composite materials, write down its practical applications(6 marks) 9 (a) What are the required properties of good refrigerant?(6 marks) 9 (b) With neat sketch explain the working of vapour compression refrigeration system.(10 marks) 9 (c) What is a air conditioning? Why it is necessary?(4 marks)