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Recent questions and answers in Bioprocess Engineering and Process Biotechnology

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1

How yeast used for whisky production is different from the baker’s yeast and brewer’s yeast?

Deepika sharma gq asked in Bioreaction Engineering May 11, 2022

by Deepika sharma gq

110 points

0 votes

4 answers

2

GATE2014-8
In a batch culture of Penicillium chrysogenum, the maximum penicillin synthesis occurs during the lag phase exponential phase stationary phase death phase

Seema MP answered in Bioprocess Engineering and Process Biotechnology Feb 16, 2021

140 points

0 votes

1 answer

3

GATE2013-47
A fed batch culture was operated with intermittent addition of glucose solution at a flow rate of $\text{200 ml h}^{-1}$. The values of $K_s,\: \mu_m$ and $D$ are $\text{0.3 g l}^{-1}, 0.4\:h^{-1}$ and $\text{0.1 h}^{-1}$, respectively. Determine the concentration of growth limiting substrate $(gl^{-1})$ in the reactor at quasi-steady state. ______________

Rama Karn answered in Bioprocess Engineering and Process Biotechnology Jan 1, 2021

140 points

0 votes

1 answer

4

GATE2018-50
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 _________

shalu_0202 answered in Bioprocess Engineering and Process Biotechnology Aug 2, 2020

140 points

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0 answers

5

GATE2014-10
Which of the following is employed for the repeated use of enzymes in bioprocesses? polymerization immobilization ligation isomerization

Milicevic3306 asked in Bioprocess Engineering and Process Biotechnology Mar 26, 2018

by Milicevic3306

7.9k points

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0 answers

6

GATE2014-12
The degree of reduction of ethanol is_______

Milicevic3306 asked in Bioprocess Engineering and Process Biotechnology Mar 26, 2018

by Milicevic3306

7.9k points

–1 vote

0 answers

7

GATE2013-48
A solution was prepared by dissolving $\text{100 mg}$ of protein $X$ in $\text{100 ml}$ of water. Molecular weight of protein $X$ is $\text{15,000 Da};$ Avogadro’s number = $6.022\times 10^{23}$. Calculate the molarity$(\mu M)$ of the resulting solution. $66.6$ $6.6$ $0.67$ $0.067$

Milicevic3306 asked in Bioprocess Engineering and Process Biotechnology Mar 26, 2018

by Milicevic3306

7.9k points

0 votes

0 answers

8

GATE2013-46
The maximum cell concentration $(\text{g l}^{-1})$ expected in a bioreactor with initial cell concentration of $\text{1.75 g l}^{-1}$ and an initial glucose concentration of $\text{125 g l}^{-1}$ is ($Y_{X/S} = 0.6\:g\:cell/g$ substrate) ____________.

Milicevic3306 asked in Bioprocess Engineering and Process Biotechnology Mar 26, 2018

by Milicevic3306

7.9k points

0 votes

0 answers

9

GATE2013-22
A chemostat is operated at a dilution rate of $0.6\; h^{-1}$. At steady state, the biomass concentration in the exit stream was found to be $30\; gl^{-1}$The biomass productivity $(g\; l^{-1}h^{-1})$ after $3h$ of steady state operation will be ___________.

Milicevic3306 asked in Bioprocess Engineering and Process Biotechnology Mar 26, 2018

by Milicevic3306

7.9k points

0 votes

0 answers

10

GATE2013-23
A batch bioreactor is to be scaled up from $\text{10 to 10,000}$ liters. The diameter of the large bioreactor is $10$ times that of the small bioreactor. The agitator speed in the small bioreactor is $\text{450 rpm}$. Determine the agitator speed (rpm) of the large bioreactor with same impeller tip speed as that of the small bioreactor. ____________

Milicevic3306 asked in Bioprocess Engineering and Process Biotechnology Mar 26, 2018

by Milicevic3306

7.9k points

0 votes

0 answers

11

GATE2018-45
An aqueous solution containing $6.8$ mg/L of an antibiotic is extracted with amyl acetate. If the partition coefficient of the antibiotic is $170$ and the ratio of water to solvent is $85$, then the extraction factor is ________

gatecse asked in Bioprocess Engineering and Process Biotechnology Feb 20, 2018

1.4k points

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0 answers

12

GATE2018-46
A microbial strain is cultured in a $100$ L stirred fermenter for secondary metabolite production. If the specific rate of oxygen uptake is $0.4 \: h^{-1}$ and the oxygen solubility in the broth is $8 $ ... $s^{-1}$) of oxygen required to achieve a maximum cell concentration of $12$ g/L is (up to two decimal places) ___________

gatecse asked in Bioprocess Engineering and Process Biotechnology Feb 20, 2018

1.4k points

0 votes

0 answers

13

GATE2018-44
Moist heat sterilization of spores at $121 ^\circ C$ follows first order kinetics as per the expression: $\dfrac{dN}{dt}=-k_dN$ where, $N$ is the number of viable spores, $t$I is the time, $k_d$ is the rate constant and $\dfrac{dN}{dt}$ is the rate of ... the number of viable spores from an initial value of $10^{10}$ to a final value of $1$ is (up to two decimal places) __________

gatecse asked in Bioprocess Engineering and Process Biotechnology Feb 20, 2018

1.4k points

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0 answers

14

GATE2018-36
Shear stress versus shear rate behavior of four different types of fluids (I, II, III and IV) are shown in the figure below. Which one of the following options is correct? I-Newtonian, II-Bingham plastic, III-Dilatant, IV-Pseudoplastic I- ... -Bingham plastic I-Newtonian, II-Pseudoplastic, III-Bingham plastic, IV-Dilatant I-Newtonian, II-Bingham plastic, III-Pseudoplastic, IV-Dilatant

gatecse asked in Bioprocess Engineering and Process Biotechnology Feb 20, 2018

1.4k points

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0 answers

15

GATE2018-13
Which one of the following bioreactor configurations is the basis for a trickling biological filter? Stirred tank Packed bed Air lift Fluidized bed

gatecse asked in Bioprocess Engineering and Process Biotechnology Feb 20, 2018

1.4k points

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Recent questions and answers in Bioprocess Engineering and Process Biotechnology