Applied Chemistry 2 - May 2015

First Year Engineering (Semester 2)

TOTAL MARKS: 60
TOTAL TIME: 2 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Use suitable data wherever required.
(4) Figures to the right indicate full marks.

Answer any five from the following:

1 (a) What are propellants? State importants characteristics of good propellant.(4 marks) 1 (b) Compare Galvanizing and Tinning.(4 marks) 1 (c) Give composition, properties and used of Wood's Metal.(4 marks) 1 (d) Write a note on 'Green Reagent'.(4 marks) 1 (e) Define terms:-
(i) Composite material (ii) Matrix phase (iii) Dispersed phase.(4 marks) 1 (f) List three main constituents of Varnish & give functions of each.(4 marks) 1 (g) A coal sample was subjected to ultimate analysis:
1.6 gm of coal on combustin in Bomb calorimeter gave 0.47 gm of BaSO4 Calculate % of sulphur in the coal sample.(4 marks) 2 (a) What is dry corrosion? Explain with example how nature of oxidised product affect the rate of corrosion.(6 marks) 2 (b) What is cracking? Explain fixed bed catalytic cracking with diagram.(5 marks) 2 (c) Calculate percentage atom economy for the following reaction w.r. to methy iso-cyanate
CH₃NH₂+COCI₂ ? CH₃-N=C=O+2HCI(4 marks) 3 (a) A gaseous fuel has the following composition by volume.
CH₄=35%, C₂H₄=5%, CO=15%, H₃=40% N₂=1 water vapour=4% Calculate volume & Weight of air required for complete combustion of 1m³ of fuel [mol.wt of air=28.94](6 marks) 3 (b) Explain conventional & green synthesis of adipic acid. Mention the green chemistry principle involved.(5 marks) 3 (c) How the rate of corrosion influenced by following factors.
i) PH of medium (ii) Over voltage(4 marks) 4 (a) What is poweder Metallurgy? How are metal powders prepared using
i) Atomization
ii) Chemical reduction(6 marks) 4 (b) What is cathodic protection? Explain Impressed current method of corrosion control.(5 marks) 4 (c) Write a note on 'Sandwich panel' type layered composites.(4 marks) 5 (a) What is Bio-diesel? Explain the trans esterification method for its synthesis. Mention advantages of biodiesel as fuel.(6 marks) 5 (b) What are alloys? Explain any four purpose of making alloys with suitable example.(5 marks) 5 (c) Discuss the physical factors influencing adhesive action.(4 marks) 6 (a) Write a note on differential areation corrosion.(5 marks) 6 (b) 2.5 gm of air dried coal sample was taken in a crucible, after heating it in an electric oven at 110°C for 1 hr the residue was weighed 2.41 gm. The residue was heated in Silica crucible covered with vented lid at a temperature 925±257°C for exactly 7 minutes. After cooling the weight of residue was found to contain 1.98 gm. The residue was then ignited to a constant weight of 0.246 gm. Report the results of above analysis.(5 marks) 6 (c) Explain the effects of following elements on alloying:
i) Nickel
ii) Chromium
iii) Cobalt
iv) Molybdenum
v) Carbon.(5 marks)