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Home⇒ Medical Science⇒ Bochemical Engineering⇒ Fermentation reactors
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ In a plug flow reactor, the highest concentration of substrates is exposed to the cells that are located near entrance of feed [other wrong options] [Discuss in forum] are near the effluent or exit of the reactor are in the mid way along the reactor are near the wall of the reactor |
Q22 ⇒ The fastest route of NADH reoxidation is fermentation [other wrong options] [Discuss in forum] aerobic respiration anaerobic respiration decomposition |
Q23 ⇒ Which of the following is best described as secondary metabolite? Penicillin [other wrong options] [Discuss in forum] Acetic acid produced from the oxidation of ethanol Ethanol from the fermentation of glucose Citric acid from the partial oxidation of glucose |
Q24 ⇒ When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out? Organism maintaining the lowest substrate concentration [other wrong options] [Discuss in forum] Organism maintaining the highest substrate concentration Both (a) and (b) Organism maintaining the moderate substrate concentration |
Q25 ⇒ A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called chemostat [other wrong options] [Discuss in forum] turbidostat level stat pH |
Q26 ⇒ A fed-batch reactor containing 1 g.l-1 of substrate in 2 litre of medium. It is fed with 1 g.l-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l-1 . The mass of substrate that was used by the culture in the reactor was 6g [other wrong options] [Discuss in forum] 2g 8g 12g |
Q27 ⇒ A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system. continuous [other wrong options] [Discuss in forum] batch fed-batch semi continuous |
Q28 ⇒ In a fluidized bed reactor, the function of the disengagement zone is to all of the above [other wrong options] [Discuss in forum] reduce loss of particles from the reactor reduce the velocity of the particles near the surface of the reactor reduce foaming problems |
Q29 ⇒ In an activated sludge process, the biomass is recycled to all of the above [other wrong options] [Discuss in forum] increase the efficiency of the process reduce sludge volumes increase the concentration of cells |
Q30 ⇒ In fed batch bioreactor modelling, the rate of change in the bioreactor volume is assumed to be equal to flow rate [other wrong options] [Discuss in forum] initial volume volume of solids in the reactor none of these |
Q31 ⇒ A microorganism which is subjected to the Crabtree effect is most likely to ferment in the presence of high concentrations of sugar and dissolved oxygen [other wrong options] [Discuss in forum] ferment in the presence of low concentrations of sugar and dissolved oxygen respire in the presence of low sugar and high dissolved oxygen concentrations respire in the presence of high sugar and low dissolved oxygen concentrations |
Q32 ⇒ Yield coefficient represents conversion efficiency of a substrate into product [other wrong options] [Discuss in forum] total biomass or product produced conversion rate of a substrate into biomass or product production time of biomass or product |
Q33 ⇒ Immobilized cell reactors for wastewater treatment have the advantage of having/being all of the above [other wrong options] [Discuss in forum] higher cell concentration more stable and prevent washout higher dilution rate before the cells washout |
Q34 ⇒ Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because cells will redirect ATP to the active transport of lactic acid and H+ out of the cells [other wrong options] [Discuss in forum] cells will redirect ATP to anabolism cells will redirect NAD+ to anabolism cells will redirect ATP to facilitate the diffusion of lactic acid and H+ out of the cells |
Q35 ⇒ Low dissolved oxygen concentrations leads to low biomass yields [other wrong options] [Discuss in forum] high biomass yields no effect on biomass yields none of the above |
Q36 ⇒ Which of the following is used to calculate mass of substrate in the reactor? Volume of reactor x substrate concentration in reactor [other wrong options] [Discuss in forum] Flow rate x substrate concentration in the reactor Flow rate x mass of reactor Volume of reactor x Flow rate |
Q37 ⇒ The growth of an organism on glucose is described by the following Monod model parameters: μm = 0.5 h-1 and Ks =0.1 g.l-1, if the concentration of glucose in the feed is 10 g.l-1 and the dilution rate is set to 0.4 h-1, then the steady state concentration of glucose in the effluent will be 0.5 g.l-1 [other wrong options] [Discuss in forum] 0 g.l-1 1.0 g.l-1 10 g.l-1 |
Q38 ⇒ Mixing in an anaerobic sludge blanket reactor is due to release of gases by the microbial populations [other wrong options] [Discuss in forum] rapid change in water temperatures throughout the reactor swimming of microbes none of the above |
Q39 ⇒ A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be 2 h-1 [other wrong options] [Discuss in forum] 2 litres 2 litres per hour 4 litres per hour |
Q40 ⇒ A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be 2 litre [other wrong options] [Discuss in forum] 1 litre 3 litre 13 litre |
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