GATE BT Bioreactor engineering PYQs & Answers — Page 4

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Questions 31–35 of 35. Imported answers require independent review unless marked reviewed.

Topic practice 35 questionsPage 4 of 4

At the end of a batch culture, glucose solution is added at a flow rate of 200 ml/h. If the culture volume after 2 h of glucose addition is 1000 ml, the initial culture volume (in ml) is

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First order deactivation rate constants for soluble and immobilized amyloglucosidase enzyme are 0.03 min⁻¹ and 0.005 min⁻¹, respectively. The ratio of half-life of the immobilized enzyme to that of the soluble enzyme is (rounded off to the nearest integer)

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A 5 liter chemostat is fed fresh medium at 0.2 liters/minute having a substrate concentration of 25 grams/liter. At steady state, the outgoing stream has substrate concentration of 2.5 grams/liter. The rate of consumption (grams/liter/minute) of the substrate in the reactor is _____.

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Growth of a microbe in a test tube is modeled as

, where, X is the biomass, r is the growth rate, and K is the carrying capacity of the environment (

;

). If the value of starting biomass is

, which one of the following graphs qualitatively represents the growth dynamics?

Your answerChoose one option.

Diagram for Biotechnology question 48 (figure 2)

Diagram for Biotechnology question 48 (figure 3)

Diagram for Biotechnology question 48 (figure 4)

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A zero-order liquid phase reaction A

B is being carried out in a batch reactor with

mol/min. If the starting concentration of A is 0.1 moles/liter, the time (in minutes) taken by the system before A is exhausted in a 100 liter reactor is ________.

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GATE BT Bioreactor engineering PYQs

Question 50

Question 52

Question 22

Question 48

Question 49