GATE Fundamentals of Biological Engineering: Bioreaction Engineering: Batch, fed-batch and continuous processes, microbial and enzyme reactors, optimization and scale up – Previous Year Questions
23 GATE previous year questions on Bioreaction Engineering: Batch, fed-batch and continuous processes, microbial and enzyme reactors, optimization and scale up (Fundamentals of Biological Engineering, Biotechnology) with answers and explanations, from every paper.
- GATE 2021 BT Q52 – A chemostat has D=0.8\ h-1, biomass 8 mol/m³ and specific product formation 0.2 mol product/(mol biomass h). Steady product concentration (mol/m³) is…
- GATE 2021 BT Q55 – Fermentation is scaled from 1 L to 1000 L at constant power/volume. Small-vessel agitation is 300 rpm and linear scale factor is 10. Large-vessel…
- GATE 2021 BT Q61 – Batch E. coli has zero-order Monod growth. At termination dissolved O2 is 10% saturation and k La=80\ h-1. Saturation is 0.007 kg/m³, maximum growth…
- GATE 2022 BT Q58 – A batch ends with 50 g biomass. Fed-batch feeding is 1 L/h of 50 g/L substrate, with maximum yield 0.4 g/g. Under quasi-steady conditions, maximum…
- GATE 2023 BT Q48 – E. coli is cultivated in a chemostat at dilution rate 0.2\ h-1. Biomass yield due to oxygen consumption is 0.2\ g/g and steady biomass concentration…
- GATE 2023 BT Q53 – The schematic shows a chemostat with cell recycle. F 0,F r are feed and recycle flow rates, and X 1,X 0,X are reactor, recycle and product cell…
- GATE 2026 BT Q44 – A microbial culture is being grown in a bioreactor with continuous aeration. The dissolved oxygen probe provided with the system shows a reading of…
- GATE 2026 BT Q45 – For a Newtonian fluid, a plot of shear stress (on Y axis) against shear rate (on X axis) will result in a straight line .
- GATE 2026 BT Q46 – In an aerobic fermentation with air sparging, which of the following options can be used to increase the volumetric mass transfer coefficient for…
- GATE 2026 BT Q47 – For a liquid flowing in a circular cross section pipe, the transition from laminar to turbulent flow will NOT depend on which of the following…
- GATE 2026 BT Q56 – A CSTR with a volume of 100 m3 is operated in cell recycle mode. At a volumetric flow rate of 10 m3 day-1 and effluent biomass of 20 mg L-1, the…
- GATE 2026 BT Q61 – A microbe that follows Monod growth kinetics on a limiting substrate (maximum specific growth rate of 0.5 h-1 and Monod constant of 0.1 mg L-1) is…
- GATE 2026 BT Q65 – A packed bed bioreactor with length 1 m and inside diameter 10 cm has liquid flowing at an interstitial velocity of 1 cm s-1. Given a volumetric flow…
- GATE 2025 BT Q25 – Which of the following fluids exhibit(s) non-Newtonian behaviour at 25 oC?
- GATE 2025 BT Q29 – For a mechanically reversible isobaric process taking place in a closed system involving 5 moles of an ideal gas, the temperature increases from an…
- GATE 2025 BT Q44 – For a specific bioreactor configuration, the power requirement for a Rushton-turbine impeller agitating an unaerated Newtonian fluid in the turbulent…
- GATE 2025 BT Q62 – A 2 L bioreactor is being operated as a chemostat, at a flow rate of 0.8 L/h and sterile feed of 10 g/L substrate. The bacterial growth follows Monod…
- GATE 2024 BT Q13 – Which one of the following statements is correct in the context of thermodynamics?
- GATE 2024 BT Q14 – Which one of the following statements is correct about Reynolds Number (N Re) in a stirred tank bioreactor?
- GATE 2024 BT Q53 – Under complete cell washout condition in a chemostat with sterile feed, which of the following statements is/are correct?
- GATE 2024 BT Q56 – Ethanol is produced in a 10,000 L stirred bioreactor using an impeller of diameter 1 m. The density and viscosity of fermentation broth are 1000 kg…
- GATE 2024 BT Q59 – A fermentor is filled with medium at a rate of 1 L min-1. A leak develops at the bottom of the fermentor when the medium in the fermentor reaches 200…
- GATE 2024 BT Q61 – Consider scale-up of fungal fermentation from a 20 L model-type to 20,000 L prototype stirred tank reactor. The model-type and prototype have the same…