Engineering FE Engineering Common Sem 2 Engineering Chemistry II Dec 2019 R16 Question Paper - Mumbai University | munotes

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Older exam May 2019 - CBSGS Semester-end · Engineering Chemistry II → Newer exam Dec 2019 - CBSGS Semester-end · Engineering Chemistry II →

Questions asked in this paper

(4) Figures to the right indicate full marks

Q1 Answer any five of the following: 15 marks
- (a) What is passivity? With an example explain how it affects the rate of corrosion?
- (b) Name a green solvent and explain its properties
- (c) Give the detailed classification of composites with examples
- (d) A coal sample was found to contain the following constituents: C= 81%, H= 6%, S =1%, N= 2%, ash = 4% and rest is oxygen Calculate the minimum weight of air required at STP for complete combustion of 1 kg of the coal sample
- (e) State and explain the Pilling Bedsworth rule
- (f) Give the classification and composition of plain carbon steels
- (g) Draw the diagram of the alkaline fuel cell and write the reactions taking place at the anode and cathode
Q2 (a) Explain the impressed current cathodic protection method with the help of
Q1 Principle and diagram
Q2 Explanation of process
Q3 Applications. 6 marks
- (b) i) 1.5gm of a coal sample was kjeldahlised and the ammonia evolved was absorbed in 49 ml N/10 H2SOs. After absorption the excess required 32.5ml of NaOH for neutralization. 0.5gm of the same coal sample was burnt in a bomb calorimeter treatment with produced of BaSOs. Calculate the percentage of nitrogen and Sulphur in the given coal samples. (3)
- ii) Give an example to explain why it is beneficial to prevent waste formation in chemical processes rather than treat waste? (2)
- (c) Classify structural composites and explain their properties and uses along with diagram
Q3 (a) Explain fixed bed catalytic cracking with the help of the following points:
Q1 Principle 11) Labelled Diagram Flow chart of process. 6 marks
- (b) i) What are special steels? Explain the properties and applications of any one type of special steel. (3)
- ii) Name the type of microscopic corrosion affecting Alpha brass and explain the conditions under which it occurs. (2)
- (c) Calculate the percentage atom economy of the following reactions with respect to the target product Maleic Anhydride and state which is the greener reaction
Q4 (a) How do the following factors affect the rate of corrosion:
Q1 Conductance of corroding medium Relative area of anode and cathode
- (b) 1) Give the traditional and green synthesis of adipic acid and compare the starting
- ii) What are the properties of composites which make them popular engineering material
- (c) Give the composition and properties of any two:
Q5 (a) A gas has following composition by volume: CO=16%, H20=20%, 15%, CH1=4%, O2 = 4% and the rest is CO2. Calculate the volume of air supplied per 2m? of the gas at STP. Also calculate the weight of air to be supplied at STP per 2m? of the gas. (Average molar mass of air at STP (6)
- (b) i) Part of an iron nail corrodes inside a piece of wood. Identify the type of corrosion and explain the mechanism with a labelled diagram and reactions. (3)
- ii) What is shape memory effect? 2
- (c) The Bhopal Gas Tragedy was one of the worst industrial disasters. With reactions explain the synthesis of the intermediate which caused the tragedy and the final product. Also give the alternative route of synthesis of the final product explaining the green chemistry principle being adhered to. (4)
Q6 What are the steps involved in powder metallurgy? Name the different moulding techniques used. Explain any one method of moulding with detailed diagram. (6)
- b) G) How are particle reinforced composites different from fibre reinforced composites? (i1) Distinguish between galvanizing and tinning. (2) 3
- (c) What is knocking? Explain the role of antiknocking agents. 4

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