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Biochemical Engineering

Water Treatment – Section 1

1. The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is A. 0.05 mg/l B. 0.09 mg/l C. 0.1 mg/l D. 1.0 mg/l Answer: OptionA 2. Zeolite softening process removes A. only temporary hardness of water B. only permanent hardness of water C. both …

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Agitation and Aeration – Section 3

1. The effect of increasing the stirrer speed in an unbaffled stirred tank reactor is that A. a small increase in stirrer speed will cause the liquid to enter the turbulent flow regime B. as the stirrer speed increases, the liquid will continue to circulate and then become turbulent C. …

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Agitation and Aeration – Section 2

1. When the height of an aerated bioreactor is increased, it will increase the oxygen transfer rate by A. increasing the partial pressure of oxygen at the base of the reactor B. decreasing the saturation concentration of oxygen in the reactor C. decreasing the gas-holdup D. all of the above …

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Agitation and Aeration – Section 1

1. Swirling and vortex formation can be prevented by A. using baffles B. using diffusion ring with turbines C. both (a) and (b) D. none of these Answer: Option C Explanation: 2. Power number is expressed as A. P0 / N2Di3ρ B. P0 / N3Di5ρ C. P0 / N3Di3ρ D. …

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Sterilization – Section 1

1. The sterilization method depends A. nature of additive B. volume and feed rate C. both (a) and (b) D. none of these Answer: Option C 2. The specific death rate of an organism can be expressed as A. ln 2/D B. D/ln2 C. D.ln2 D. 2.0.3/ln2 Answer: Option A …

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Fermentation Reactors – Section 2

1. In a glucose-yeast extract medium, Lactococcus lactis has a maximum specific growth rate (um) of 1.23 h-1. What would be the specific growth rate of this organism at steady state in a 4 litre reactor being fed at 2 litres per hour? A. 0.5 h-1 B. 1.2 h-1 C. …

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Fermentation Reactors – Section 1

1. Yield coefficient represents A. total biomass or product produced B. conversion efficiency of a substrate into product C. conversion rate of a substrate into biomass or product D. production time of biomass or product 2. The lowest biomass yield in a culture of Escherichia coli will be in A. …

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Immobilized Enzyme – Section 1

1. Water insoluble enzymes can be prepared by using multifunctional agents that are bifunctional in nature and have A. low molecular weight B. high molecular weight C. high equivalent weight D. low reactivity Answer: Option A 2. Functional groups of the nonessential amino acid residues that are suitable for the …

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Downstream Processing – Section 1

1. Concentration polarization can be reduced further by A. pre filtering the solution B. reducing the flow rate per unit membrane surface area C. back washing periodically D. all of the above Answer: Option D 2. A system which require less solvent and produces a more concentrated extract phase, is …

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Fluid Flow – Section 1

1. The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosity A. increased with stirring speed but decreased with mixing time B. increased with stirring speed and increased with mixing time C. decreased with stirring speed but increased with mixing time D. decreased with …

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