⚗️ Biochemical Engineering Solved MCQs with Answers

Practice 513 approved ⚗️ Biochemical Engineering questions with verified answers from the 🧬 Medical Science subject for Pakistan exams.

513 solved MCQs

The value of KAnswer: Increases to an optimum with increase in air velocity and decreases on further increase of air velocity Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where Nₛₜ is the Stokes number)Answer: ηᵢₘₚ = 0.075Nₛₜ¹⋅² The collection efficiency by impaction increases withAnswer: Both (a) and (b) The heat conduction in dry air isAnswer: Less rapid than in steam For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity isAnswer: 0.5 The reduction of number of cells from 10¹⁰ to one will result into the del factor (Δ) ofAnswer: 23 Sterilization can be carried out byAnswer: All of these The collection efficiency by the inertial impaction mechanism is the function ofAnswer: Stokes and Reynolds number The heated medium passes through a holding section, which is usually maintained inAnswer: Adiabatic conditions The highest temperature which appears to be feasible for batch sterilization isAnswer: 121°C The K used in the equation for X10=2.303/K depends uponAnswer: Both (a) and (b) The mechanical means of accomplishing sterilization of fermentation media/equipment isAnswer: Ultrasonic The radius of the filter with a depth of 14 cm required for a volumetric airflow rate of 10 m³/min is approximatelyAnswer: 0.6 m The moist heat is more effective than the dry heat because the intrinsic heat resistance of vegetative cells is greatlyAnswer: Increased in a dry state The destruction of microorganisms by steam may be described asAnswer: first order chemical reaction Typical aeration rates for aerobic fermentation areAnswer: 0.5 - 1.0 vvm The viscosity of liquid was classified as both dilatant and rheopectic, which means that the viscosityAnswer: Increased with stirring speed and increased with mixing time Which of the following describes the detrimental effect of bubbles on animal cells?Answer: Both (a) and (b) A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented asAnswer: Pseudoplastic, thixotropic fluid Filamentous fungal cells are more shear sensitive than bacterial cells because ofAnswer: All of these The viscosity of water at STP is approximatelyAnswer: 0.001 kg.m⁻¹.s⁻¹ Bubble free aeration systems requiresAnswer: Silicone tubing or gas permeable membranes to facilitate gas transfer Non-linear relationship between shear stress and shear rate exists inAnswer: Non-newtonian fluids If the viscosity of a fluid decreases with increasing stirrer speed, then the nature of the fluid isAnswer: Pseudoplastic A pseudoplastic fluid is one in which the viscosityAnswer: Decreases with increasing stirrer speed A viscoelastic fluid is one in which the viscosityAnswer: Changes during mixing but returns to its original state after mixing Mixing in stirred tank reactors canAnswer: Be described as either laminar, transient or turbulent In animal cell bioreactor, bubble damage can be minimized byAnswer: All of these The viscosity of a fluid changes with either stirrer speed or mixing time. But when mixing ceases, the viscosity returns to its original state. This fluid is best described asAnswer: Viscoelastic In sparged mammalian cell bioreactors, the cell damage is caused because ofAnswer: Shear stress arising during mixing of the cell culture fluid