Engineering Chemistry Unit 4 Important Questions AKTU (BAS102)

AKTU · BTECH · Semester 1, 2 · Engineering Chemistry · Unit 4 · Important Question

AKTU Engineering Chemistry (BAS102) Unit 4 important questions for B.Tech Semester 1/2 – Water Technology and Fuels. Topics: Hardness of Water, Boiler…

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Unit 4: Water Technology and Fuels – AKTU syllabus topics

  • Hardness of Water: Types and Sources of Hardness, Determination of Hardness Numericals
  • Boiler Troubles
  • Water Softening Techniques: Lime Soda Process, Zeolite Process, Ion Exchange Process, Reverse Osmosis Process
  • Calorific Value of Fuels: Bomb Calorimeter Method, Dulong Formula Numericals
  • Coal Analysis: Proximate Analysis of Coal, Ultimate Analysis of Coal
  • Biogas Production

Most asked AKTU PYQ questions from Unit 4

  1. Q2c. The percentage composition of coal sample is: C = 70%, H2 = 10%, O2 1%, S = 5%, ash = 0.5% and N = 0.3%. (i) Calculate the quantity of air needed for complete combustion of 1kg of coal, if 60% excess of air is supplied. (ii) Calculate the gross and net calorific value of the coal using Dulong's… (10 marks, 2020-21)
  2. Q6a. Draw diagram of Bomb calorimeter. Explain proximate analysis of coal. (10 marks, 2020-21)
  3. Q6b. Explain Ion exchange process of water softening. Zeolite softener was 90% exhausted, when 10,000 L hard water was passed through it. The softener required 200 L of NaCl solution of strength 50 gm/L. Calculate the hardness of water. (10 marks, 2020-21)
  4. Q2d. A sample of coal was burnt in a bomb calorimeter. The following data were obtained: Mass of coal = 0.92 g, Mass of water = 2500 g, Water equivalent of calorimeter = 600 g, Rise in temperature = 2.85°C, Percentage of hydrogen in coal = 3.2%. Calculate HCV and LCV of coal. (Latent heat of steam =… (7 marks, 2025-26)
  5. Q6b. Calculate the amount of lime (87% pure) and soda (91% pure) required to soften 1,00,000 litres of water containing: Ca(HCO₃)₂ = 32.4 mg/L, Mg(HCO₃)₂ = 29.2 mg/L, MgCl₂ = 19 mg/L, CaSO₄ = 13.6 mg/L, CO₂ = 22 mg/L. (7 marks, 2025-26)
  6. Q2d. Explain the Lime–Soda process of water softening. What are the advantages and limitations of this process? Calculate the amount of lime and soda required for the treatment of 10,000 litres of water whose analysis is as follows (in mg/L): Mg(HCO3)2=73; CaSO4=102; MgCl2=95; MgSO4=24;… (7 marks, 2024-25)
  7. Q6a. Explain the different parameters that are determined in the proximate analysis of coal. On burning 0.92g of a solid fuel in a bomb calorimeter, the temperature of 3300g of water increased by 2.42°C. Water equivalent of calorimeter and latent heat of steam are 385.0g and 587.0cal/g, respectively.… (7 marks, 2024-25)
  8. Q2d. Illustrate the principle and working of the Zeolite process. A zeolite softener was regenerated by passing 50L of NaCl solution having strength of 40% of NaCl. Calculate the hardness of water if 10000L of hard water was softened by using this zeolite. (7 marks, 2023-24)
  9. Q6a. Explain the principle of water softening by lime – soda process. Calculate the amount lime and soda required for 100,000 L of water containing the following salt: Mg2+= 48 ppm, Ca2+ = 120ppm, FeSO4.7H2O = 139 ppm, CO2=88ppm, NaNO3 = 8.9ppm, HCO3- = 122 ppm. (7 marks, 2023-24)
  10. Q6b. With the help of a neat diagram, explain the working of Bomb calorimeter. A sample of coal contain C=91%, H=6%, N=2% and ash=1%. The following data were obtained when the above coal was tested in bomb calorimeter: Weight of coal burnt= 0.97 g, Weight of water taken= 800 g, Water equivalent of bomb… (7 marks, 2023-24)

AKTU paper codes: BAS102, BAS202, KAS102, KAS202

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