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Submit Papers 📩Total No. of Questions : 6
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EXS-70
B.Tech. Ist Semester (CSE, IT & Electronics)
Examination, 2023
Engineering Chemistry
Paper - BE-102
Time : 3 Hours]
[Maximum Marks : 60
Note :- Attempt all questions. Questions shall be attempted section wise at one place.
Write short answer of the following : 2x5=10
(a) Define Alkalinity of water. Write the name of three important parameters causing alkalinity in water.
(b) Why pulverised coal used as a gaseous fuel.
(c) What is meant by passivity of metals ?
(d) Write the dimension of the jet nozzle of redwood vis-cometer No I
(e) Define Chemical oxygen demand.
(a) Calculate the amount of lime and soda required for soft-ening of 1500 lit of water having Ca (HCO₃)₂ = 45.5 ppm, Mg (HCO₃)₂ = 32.5 ppm, CaCl₂ = 34 ppm, NaCl = 8 ppm 10
(b) Write a short note on Rapid gravity filteration.
OR
(a) Write short notes on
(i) Scale and sludge formation
(ii) Settling of water
(a) How good quality coke can be manufactured by Ottohoffmann Oven Process ? 10
(b) Find out the weight and volume of air actually required for complete combustion of 0.5 Kg of coal.
OR
(a) Why thin lubricating oils show lower viscosity Index ? 3
(b) How a lubricant works ? Clearly mention the mechanism of lubrication with reduction of shearing strength of material. 7
(a) Write informative notes on Fuel cells. 10
(b) Comments on control and prevention of corrosion by sacrificial anode.
OR
(a) What are the various thermo dynamic functions ? What are the applications of Nernst Equation ? 10
(b) Discuss the various aspects of differential oxidation theory of electrochemical corrosion ?
(a) Which chemical reactions occur with hardening and set-ting of cement ? Signify the role of gypsum. 10
(b) Write critical note on Silicones.
OR
(a) What is meant by refractoriness ? Give characteristics and uses of Alumina refractory. 10
(b) Define polymers and discuss mechanism of polymerisation.
(a) What is the principle of NMR ? Give block diagram of the instrument. 10
(b) What is the major threat of nuclear pollution ? Summarise as an effective note.
OR
(a) Write short Dissolved Oxygen. 10
(b) What is the major cause of Land pollution ? Summarise as an effective note.