GATE Fundamentals of Biological Engineering: Bioreaction Engineering: Kinetics of cell growth, substrate utilization and product formation, structured and unstructured models – Previous Year Questions
34 GATE previous year questions on Bioreaction Engineering: Kinetics of cell growth, substrate utilization and product formation, structured and unstructured models (Fundamentals of Biological Engineering, Biotechnology) with answers and explanations, from every paper.
- GATE 2021 BT Q20 – Under standard T and P, 128 g of ideal gas A occupies 1 L and obeys RT=0.25PV. R is the universal gas constant. A is
- GATE 2021 BT Q34 – Two reactors contain ideal gases: R1 has 5 L at 9 atm, R2 has 10 L at 6 atm. Opening their connecting valve at constant temperature gives equilibrium…
- GATE 2021 BT Q36 – Which plot represents non-growth-associated product formation? X and P are viable-cell and product concentrations.
- GATE 2021 BT Q56 – A mold grows exponentially at 0.15 h⁻¹. Its concentration at 30 h is 33 g/L. Concentration at 24 h (nearest integer g/L) is .
- GATE 2021 BT Q60 – A binary feed F 1 splits into F 2 bypass and F 3 separator feed. Separation gives F 4,F 5; mixer combines F 2,F 5 into F 6. Stream compositions are x…
- GATE 2021 BT Q62 – Milk in a stainless-steel inner tube (inner diameter 40 mm) is heated from 10°C to 85°C by steam condensing at 120°C. Heat transfer is 146200 kcal/h…
- GATE 2021 BT Q65 – For 2CH 3CH 2OH+2O 22CH 3COOH+2H 2O, the thermodynamic maximum acetic-acid yield from ethanol (two decimal places g/g) is .
- GATE 2022 BT Q13 – For a double-pipe heat exchanger, the inside and outside heat transfer coefficients are 100 and 200 W m-2 K-1, respectively. The thickness and thermal…
- GATE 2022 BT Q16 – The overall stoichiometry is 3C 6H 12O 6+2.5NH 3+O 21.5C aH bO cN d+3CO 2+5H 2O. What is the biomass elemental formula?
- GATE 2022 BT Q28 – A batch culture has apparent yield 0.5 g biomass/g substrate and initial biomass and glucose concentrations 2 g/L and 200 g/L. With no endogenous…
- GATE 2022 BT Q29 – The degree of reduction of lactic acid (C3H6O3) is .
- GATE 2022 BT Q33 – The specific growth rate of a yeast having a doubling time of 0.693 h (rounded off to nearest integer) is h-1.
- GATE 2022 BT Q34 – A broth has density 1000\ kg/m3 and viscosity 10-3\ kg\ m-1s-1. A 100 L fermenter uses a 0.1 m impeller at 2\ s-1. The impeller Reynolds number is .
- GATE 2022 BT Q35 – The melting-line slope at −2°C is -5.0665106\ Pa/K and liquid-minus-solid molar volume is -4.510-6\ m3/mol. The latent heat of fusion (J/mol, nearest…
- GATE 2022 BT Q57 – The diagram depicts production of B from A in a cell. Subscript i denotes intracellular metabolites and r j is flux in g/(g dry mass h). At…
- GATE 2022 BT Q60 – Oxygen bulk and saturation concentrations are 10-4 and 10-3 mol/L, uptake is 910-4 mol/(L s), and interfacial area is 100\ m2/m3. The steady liquid…
- GATE 2022 BT Q61 – An insulated cylinder contains 1 mol ideal gas at 300 K. A weightless frictionless piston suddenly rises by 1 m against atmospheric pressure 1.013105…
- GATE 2022 BT Q62 – Aerobic yeast has growth rate 0.5\ h-1 and stoichiometry 2C 6H 12O 6+0.2NH 3+10.35O 2 CH 1.8O 0.5N 0.2+0.2C 2H 6O+10.6CO 2+10.8H 2O. Combustion heats…
- GATE 2022 BT Q65 – An aerobic bacterial culture at 37°C starts with 102 cells and reaches 105 after 10 h. The doubling time (nearest integer h) is .
- GATE 2023 BT Q46 – The following reaction represents biomass synthesis from hexadecane: C 16H 34+12.5O 2+2.13NH 310.6CH 1.66O 0.27N 0.27+5.37CO 2+11.4H 2O. The value of…
- GATE 2023 BT Q62 – A dilatant fluid has consistency index K=0.415 (CGS) and flow index n=1.23. Its apparent viscosity (g\ cm-1s-1) at shear rate 60\ s-1, rounded to the…
- GATE 2023 BT Q63 – An evaporator has 0.15 m glass-wool insulation, inner and outer temperatures 700°C and 80°C, mean conductivity 0.29\ W\ m-1K-1 and wall area 1.2\ m2.…
- GATE 2026 BT Q34 – Given below is the Gibbs free energy change ( G) in kilo Joules per electron equivalent (kJ e-eq-1) at pH 7.0, of organic and inorganic half…
- GATE 2026 BT Q40 – By elemental analysis of a biomass sample, it was found that the cells in the given sample are composed of (by weight) C=50%, H=8%, O=20%, N=10% and…
- GATE 2026 BT Q55 – A microbial culture (following Monod model for growth) has a maximum specific growth rate of 0.1 h-1, Monod constant of 1 mg L-1 and endogenous decay…
- GATE 2026 BT Q57 – The electron equivalent per liter (e-eq L-1) of acetate ion solution of concentration 10 g L-1 is e-eq L-1. (rounded off to one decimal place)
- GATE 2025 BT Q26 – Which of the following compounds have the same degree of reduction per carbon-mole?
- GATE 2025 BT Q28 – If the doubling time of a bacterial population is 3 hours, then its average specific growth rate during this period is h-1. (Round off to two decimal…
- GATE 2025 BT Q58 – In a fermentation process, each mole of glucose is converted to biomass (CH 1.8O 0.5N 0.2), with a biomass yield coefficient of 0.4 C-mol/C-mol,…
- GATE 2024 BT Q33 – The degree of reduction (reductance) for oxalic acid (C 2H 2O 4) is .
- GATE 2024 BT Q34 – If the rate at which E. coli divides is 0.5 h-1, then its doubling time is h.
- GATE 2024 BT Q52 – Which of the following factors can affect the growth of a microbial culture in a batch cultivation process?
- GATE 2024 BT Q58 – E. coli is inoculated in a shake flask containing nutrient rich medium. The initial number of viable cells in the medium is 102. After few hours, the…
- GATE 2024 BT Q60 – A fed batch process is running at quasi-steady state with respect to substrate and biomass concentration. At 2 h, the culture volume is 500 L with a…