Biotechnology
2021 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE BT 2021 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 55–57 of 65. Imported answers require review unless explicitly marked reviewed.
Question 45
Open questionBTNAT2 marksNeeds review
It is desired to scale-up a fermentation from 1 L to 1000 L vessel by maintaining a constant power-to-volume ratio. The small fermenter is operated at an agitator speed of 300 rotations per minute (rpm). If the value of scale up factor is 10, agitator speed in rpm (rounded off to the nearest integer) for the large fermenter is _____.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 46
Open questionBTNAT2 marksNeeds review
The specific growth rate of a mold during exponential phase of its growth in a batch cultivation is 0.15 h⁻¹. If the cell concentration at 30 h is 33 g L⁻¹, the cell concentration in g L⁻¹ (rounded off to the nearest integer) at 24 h is _____.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 47
Open questionBTNAT2 marksNeeds review
A sedimentation tank of height 100 cm is used in a conventional activated sludge process to separate a suspension of spherical shaped granular sludge biomass of 0.5 mm diameter. The viscosity of the liquid is 1 cP. The difference in density between the suspended biomass and the liquid is 0.1 g cm⁻³. If the biomass reach their terminal velocity instantaneously, the biomass settling time in min (rounded off to two decimal places) is _____.
Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer