Process Calculations — Major (End Semester) 2026 question paper

Paper details

• Subject: Process Calculations (BCH-201)
• Branch: Chemical Engineering
• Semester: 3
• Exam: Major (End Semester) 2026
• Questions: 20

Questions asked in Process Calculations Major (End Semester) 2026

1. Q1(a). Oxygen is prepared according to the equation 2KClO3=2KCl+3O2. What is the yield of oxygen when 10 grams of potassium chlorate are decomposed? [2 marks]
2. Q1(b). How much potassium chlorate must be taken to produce the same amount of oxygen as will be produced by 10 grams of mercuric oxide? [2 marks]
3. Q1(c). A limestone analyzes CaCO3 90 %, MgCO3 6 %, and insoluble matter 4 %. How many pounds of calcium oxide could be obtained from 500 g of limestone? [2 marks]
4. Q1(d). Data based on Q 1(c), How many pounds of carbon dioxide are given off per pound of this limestone? [2 marks]
5. Q1(e). Define relative and percentage saturation and derive the relationship between relative and percentage saturation. [2 marks]
6. Q1(f). Calculate the density of oxygen in pounds per cubic foot at normal conditions. [2 marks]
7. Q1(g). Define, Heat capacity, specific heat capacity, net and gross calorific value. [2 marks]
8. Q2(a). A natural gas has the following composition by volume: methane-90 %, hydrogen-3 %, nitrogen-6 %, oxygen-1 %; This gas is piped from the well at a temperature of 20 °C and a pressure of 30 lb/inch². It may be assumed that the ideal gas law is applicable. : (i) Calculate the partial pressure of the oxygen. (ii) Calculate the density of the mixture in pounds per cubic foot at the existing conditions. [5 marks]
9. Q2(b). A furnace is to be designed to burn coke at the rate of 200 lb per hour. The coke has the following composition: Carbon-89.1%; Ash-10.9% The grate efficiency of the furnace is such that 90% of the carbon present in the coke charged is burned. Air is supplied in 30% excess of that required for the complete combustion of all the carbon charged. It may be assumed that 97% of the carbon burned is… [5 marks]
10. Q2(c). Based on the data of Q2(b), If the flue gases leave the furnace at a temperature of 550°F and a pressure of 743 mm Hg, calculate the RATE OF FLow of gases cubic per minute for which the stack must be desgined. [5 marks]
11. Q3(a). a) A mixture of ammonia and air at a pressure of 745 mm of Hg and a temperature of 40°C contains 4.9% NH3 by volume. The gas is passed at a rate of 100 cu ft per min through an absorption tower in which only ammonia is removed. The gases leave the tower at a pressure of 740 mm of Hg, a temperature of 20°C, and contain 0.13% NH3 by Volume. Using the ideal gas law, calculate: (i) The rate of flow… [5 marks]
12. Q3(b). b) In the Deacon process (4HCI + O2 → 2Cl2 + 2H2O) for the manufacture of chlorine, a dry mixture of hydrochloric acid gas and air is passed over a heated catalyst which promotes oxidation of the acid. Air is used in 30% excess of that theoretically required. (i) Calculate the weight of air supplied per pound of acid. (ii) Calculate the composition, by weight, of the gas entering the reaction… [5 marks]
13. Q3(c). In order to obtain barium in a form which may be put into solution, the natural sulfate, barytes, is fused with sodium carbonate, A quantity of barytes, containing only pure barium sulfate and infusible matter, is fused with an excess of pure, anhydrous soda ash. Upon analysis of the fusion mass found to contain 11.3% barium sulfate, 27.7% sodium sulfate, and 20.35% sodium carbonate. The… [5 marks]
14. Q4(a). Sulphur dioxide is being manufactured in a small pilot plant experiment by the direct oxidation of sulphur. The sulphur is fed in an air stream to the burner as a powder in the rhombic form at a temperature of 25°C. Air is supplied to the burner at the rate of 500 gm moles/hr at 50°C. Before the products are fed to the separation stage where SO2 to recovered, they are cooled to 150°C in a heat… [5 marks]
15. Q4(b). Dry methane is burned with dry air and both are at initially at 25 C. The flame temperature is 1297 "C. If complete combustion is assumed, how much excess air to be used. Given, Heat for reaction=200000 cal/mol. Specific heat capacity of CO2, H2O, N2 and air are 12.37, 9.6, 7.68 and 7.74 cal/mol/°C respectively. [5 marks]
16. Q4(c). Write the industrial significance of following term. i. Recycle il. Bypass ili. Purging iv. Forward feed evaporator v. Backward feed evaporator [5 marks]
17. Q5(a). A continuous operation distillation column, operating at 1 atm is to be designed to separate 13620 kg/hr of a solution of benzene and toluene containing 0.4 mass fraction benzene, into an overhead product containing 0.97 mass fraction benzene and bottom product containing 0.98 mass fraction toluene. A reflux ratic of 3.5 kg of reflux per kg of product is to be used. The feed will be at boiling… [5 marks]
18. Q5(b). A solution containing 3 kg salt per 100 kg solution is evaporated to 15% in an evaporator. The heat capacity of the solution is 0.98 kcal/kg/oC and that of the 15% solution is 0.90. The feed temperature is 20 °C and boiling point of the evaporator is 104 °C. It is requiring 540 kcal to evaporate 1 kg of water from the boiling solution. The steam gives up only its latent heat of vaporization, 525…
19. QQ.1. Attempt any five parts of the following.
20. QQ.2. Attempt any Two parts of the following.