GATE BT 2022 Paper 1 — page 20

Questions 58–60 of 65. Imported answers require review unless explicitly marked reviewed.

The amount of biomass in a reactor at the end of the batch process is 50 g. Fed-batch operation is initiated by feeding the substrate solution at a constant rate of 1 L h

. The concentration of substrate in the feed is 50 g L

. The maximum biomass yield (

) is 0.4

. Assuming the system is at quasi-steady state, the maximum amount of biomass after 5 h of feeding is ____________ g.

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An enzyme catalyzes the conversion of substrate A into product B. The rate equation for this reaction is

Substrate A at an initial concentration of 10 mol L

enters an ideal mixed flow reactor (MFR) at a flow rate of 10 L min

. The volume of the MFR required for 50% conversion of substrate to product is __________ L.

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Liquid-phase mass transfer coefficient (

) is measured in a stirred tank vessel using steady-state method by sparging air. Oxygen uptake by the microorganism is measured. The bulk concentration of O

mol L

. Solubility of O

in water at 25 °C is

mol L

If the oxygen consumption rate is

mol L

, and interfacial area is 100 m

, the value of

is __________ cm s

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2022 · Paper 1

Question 58

Question 59

Question 60