GATE BT branch:bt PYQs & Answers — Page 39

Questions 381–390 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 39 of 65

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 _____.

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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 _____.

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In a random mating population, Y and y are dominant and recessive alleles, respectively. If the frequency of Y allele in both sperm and egg is 0.70, then the frequency of Y/y heterozygotes (rounded off to two decimal places) is _____.

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Calculate the following integral:

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A feed stream (

) containing components

and

is processed in a system comprising of separation unit and a mixer as shown below in the schematic diagram. The mole fraction of the components

and

are

and

, respectively. If

, the degrees of freedom of the system is ________.

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A batch cultivation of

follows zero order Monod’s growth kinetics. The cell growth is terminated when the residual dissolved oxygen concentration attains 10% of its saturation value and oxygen mass transfer coefficient (

) reaches its maximum value (

). The saturation value of dissolved oxygen concentration is

. If the maximum specific growth rate and yield coefficient (

) are

and

, respectively, then the final cell concentration in

(rounded off to two decimal places) at the end of the batch cultivation is ________.

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Milk flowing through a stainless steel inner tube (40 mm inner diameter) of double tube-type heater is to be heated from

by saturated steam condensing at

on the outer surface of the inner tube. Total heat transferred (

) is

and the overall heat transfer coefficient is

. The total length of the heating tube in

(rounded off to one decimal place) is ________.

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A DNA solution of

concentration gives an absorbance of 1.0 at 260 nm. An aliquot of

from a

purified plasmid solution is diluted with distilled water to a total volume of

. The diluted plasmid solution gives an absorbance of 0.50 at 260 nm. The concentration of the purified plasmid in

(rounded off to two decimal places) is ________.

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The possible number of SalI restriction sites in a 9 kb double-stranded DNA, with all four bases occurring in equal proportion (rounded off to the nearest integer) is ________.

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A bacterium produces acetic acid from ethanol as per the following reaction

The thermodynamic maximum yield of acetic acid from ethanol in

(rounded off to two decimal places) is ________.

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GATE BT branch:bt PYQs

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