Tag: dbt jrf 2019

146. A substrate is consumed in a zero order reaction such that the concentration falls from 40 g/l to 20 g/l in 4 h. How long will it take the […]

145. The maximum yield for microbial conversion of Glucose (C6H12O6) to ethanol (C2H5OH) on a mol/mol basis is approximately: (1) 1 (2) 2 (3) 3 (4) 0.5 Detailed Explanation: Question:The […]

144. During mixed acid fermentation by E. coli, which one of the following is NOT produced? (1) Lactic acid (2) Ethanol (3) Succinic acid (4) Citric acid Detailed Explanation: Question:During […]

143. If the pulse input response curve for a CSTR shows a long tail, it means: (1) Strong internal circulation in the reactor (2) Dead space in the reactor (3) […]

142. A catalyst: (1) Reduces the free energy change of the reaction (2) Increases the free energy change of the reaction (3) Reduces the activation energy of the reaction (4) […]

141. Glycerol is a: (1) Newtonian fluid (2) Pseudoplastic fluid (3) Thixotropic fluid (4) Dilatant fluid Detailed Explanation: Question:Glycerol is a: (1) Newtonian fluid (2) Pseudoplastic fluid (3) Thixotropic fluid […]

140. In developing a structured model for microbial cell growth, we: (1) separate the population by age. (2) compartmentalize the cell into different components. (3) separate the cells by age […]

139. Reynold’s number is ratio of: (1) viscous force to inertial force. (2) inertial force to viscous force. (3) gravitation force to inertial force. (4) inertial force to gravitational force. […]

138. For a Rushton turbine impeller (Reynold’s number greater than 10,000) when RPM is doubled, the power absorption increases by: (1) 2 fold (2) 4 fold (3) 8 fold (4) […]

137. In a batch reactor, which one of the following is true regarding specific growth rate? (1) It remains constant with time. (2) It continuously increases with time. (3)It continuously […]