Elements of Mechanical Engg. - Dec 2014

First Year Engineering (P Cycle) (Semester 2)

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. 9(a) With a suitable sketch explain the working of Vapour absorption refrigeration system. (10 marks) 1(a) Define fuel, calorific value. Describe two types of the calorific values of fuel. (6 marks) 1(b) With the help of Temperature -Enthalpy diagram explain the generation of steam at constant pressure.(10 marks) 1(c) Distinguish between Non-renewable and renewable energy resources.(4 marks) 10(a) With a suitable sketch explain the working of Vapo urcompression refrigeration system. (4 marks) 10(b) Define the terms a) Refrigeration b) Refrigerating effect c) Ton of Refrigeration d) Ice making capacity, and e) Refrigeration cycle(8 marks) 2(a) With a neat sketch explain the working of Babcock and Wilcox Boiler. (10 marks) 2(b) With the help of line diagrams, describe how sol ar energy and hydel energy can be used to generate electric power. (10 marks) 3(a) With a neat sketch explain the working of Parson's turbine. (8 marks) 3(b) With neat sketches explain the working of a 4 stroke Petrol engine. (8 marks) 3(c) Differentiate between Open-cycle and Closed-cycle gas turbines. (4 marks) 4(a) With a neat and labeled sketch explain the working of Francis turbine(8 marks) 4(b) Following observations are taken during a trial on 4 stroke petrol engine. Brake drum diameter=60.03cm, full brake load on drum=250 N, brake drum speed=450 rpm, Calorific value of petrol= 40 MJ/kg, brake thermal efficiency , mechanical efficiency , Specific gravity of fuel=0.82.Calculate a) Indicated Power b) Brake p+D30ower c) indicated thermal efficiency, and d) fuel consumption in kg/hr and liters/sec. (8 marks) 4(c) Differentiate between Reaction and impulse water turbines. (4 marks) 5(a) With suitable sketch explain Taper Turning by wiveling the compound rest.(6 marks) 5(b) Define Robot. List out the advantages and disadvantages of a robot. (8 marks) 5(c) Define automation. List out the advantages and d isadvantages of automation. (6 marks) 6(a) Define automation. Classify different types of automation. (8 marks) 6(b) Discuss the various industrial applications of Robot (8 marks) 6(c) Define Boring, Reaming, Tapping, Counter Sinking operations.(4 marks) 7(a) Compare soldering and brazing processes.(4 marks) 7(b) Define a composite material. How are composite materials classified?Give example for each. (8 marks) 7(c) State the composition and application of any four f errous metals. (8 marks) 8(a) What are the differences between soldering and weld ing processes? (4 marks) 8(b) What are the key applications of composite materials in Aerospace and Automotive industries? (10 marks) 8(c) State the composition, properties and applications of high carbon steels. (6 marks) 9(b) With suitable skectches explain the working of Room air conditioning system.(10 marks)