GATE BT 2019 Paper 1 — page 21

Questions 61–63 of 65. Imported answers require review unless explicitly marked reviewed.

Yeast biomass (C₆H₁₀O₃N) grown on glucose is described by the stoichiometric equation given below: C₆H₁₂O₆ + 0.48 NH₃ + 3 O₂ → 0.48 C₆H₁₀O₃N + 3.12 CO₂ + 4.32 H₂O

The amount of glucose needed for the production of 50 g L⁻¹ of yeast biomass in a batch reactor with a working volume of 1,00,000 L is ______ kg (rounded off to the nearest integer).

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Phenolic wastewater discharged from an industry was treated with Pseudomonas sp. in an aerobic bioreactor. The influent and effluent concentrations of phenol were 10,000 and 10 ppm, respectively. The inlet feed rate of wastewater was 80 L h⁻¹. The kinetic properties of the organism are as follows: Maximum specific growth rate (μₘ) = 1 h⁻¹ Saturation constant (Kₛ) = 100 mg L⁻¹ Cell death rate (k_d) = 0.01 h⁻¹ Assuming that the bioreactor operates under ‘chemostat’ mode, the working volume required for this process is ______ L (rounded off to the nearest integer).

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In a cross-flow filtration process, the pressure drop (ΔP) driving the fluid flow is 2 atm, inlet feed pressure (Pᵢ) is 3 atm and filtrate pressure (P_f) is equal to atmospheric pressure. The average transmembrane pressure drop (ΔPₘ) is ______ atm.

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2019 · Paper 1

Question 51

Question 52

Question 53