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Q.63 A DNA solution of 50 µg mL−1 concentration gives an absorbance of 1.0 at 260 nm. An aliquot of 20 µL from a 50 µL purified plasmid solution is […]

Q.62 Milk flowing through a stainless steel inner tube (40 mm inner diameter) of double tube-type heater is to be heated from 10 °C to 85 °C by saturated steam […]

Q.61 A batch cultivation of E. coli follows zeroth order Monod’s growth kinetics. The cell growth is terminated when the residual dissolved oxygen concentration attains 10% of its saturation value […]

Q.60 A feed stream (F1) containing components A and B is processed in a system comprising of separation unit and a mixer as shown below in the schematic diagram. The […]

Q.59 Calculate the following integral ∫0π2/4 sin√x   dx = ________. Solving ∫ from 0 to π2/4 of sin(√x) dx The definite integral ∫0π2/4 sin(√x) dx equals 2. This result […]

Q.58 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 […]

Q.57 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. […]

Q.56 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 […]

Q.55 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 […]

Q.54 The determinant of matrix A = ⎛ 1    1    1    1 ⎞ ⎜ −1    1    1    1 ⎟ ⎜ −1    −1    […]