⚗️ 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 conventional filtration involves the separation of large particles generallyAnswer: dₚ>10μm Which of the operation does not come under upstream processing?Answer: Effluent treatment For cost analysis in a fermentor system, the depreciation cost varies fromAnswer: 6-10% of the capital cost Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes ofAnswer: 0.02 to 10μm Start up expenses in a fermentation industry varies fromAnswer: 5-10% of the capital cost The solvent flux across the membrane can be expressed as (where A is the area, Lₚ is the membrane permeability, σ is the reflection point, Δp is applied pressure and Δπ is the osmotic pressure)Answer: J = Lₚ(Δp - σΔπ) Which of the following is considered as a pretreatment to the biological feeds?Answer: All of these For the extractions operation, the selectivity should beAnswer: > 1 The purity of a solute collected between two times t1 and t2 during chromatographic separation can be calculated asAnswer: Amount of solute eluted / amount of impurity eluted Chromatography is based on theAnswer: Different rate of movement of the solute in the column The correlation often employed to correlate adsorption data for protein is (where Yₘₐₓ is the maximum amount of solute adsorbed per mass of adsorbent, X is the mass fraction of solute in the diluent phase in solute-free basis, Kₗ is a constant and Y is the equilibrium value of the mass of solute adsorbed per mass of adsorbent)Answer: Y = YₘₐₓX/(Kₗ+X) A typical tubular centrifuge has a bowl of 2 to 5 inch in diameter and 9 to 30 inch in height with a maximum rotating speed ofAnswer: 15,000 to 50,000 rpm The sterilization method dependsAnswer: Both (a) and (b) The specific death rate of an organism can be expressed asAnswer: ln 2/D The interception efficiency can be expressed as (where dₚ is the particle diameter and D꜀ cylindrical collection diameter)Answer: dₚ/D꜀ The relationship between the del factor, temperature and time is given asAnswer: Δ = A.t. e⁻ᴱ⧸ᴿᵀ The del factor (Δ) increases as the final number of cellsAnswer: Decreases The filter material used for air filtration system is/areAnswer: All of these The deviation from ideal plug flow due to axial mixing can be described by theAnswer: Dispersion model The collection efficiency by diffusion increases withAnswer: Both (a) and (b) Glass fibers are favorable as a filter medium because they give aAnswer: Lower pressure drop and are less liable to wetting or combustion The collection efficiency by interception increases with theAnswer: Increasing particle size For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to itsAnswer: Larger heat transfer area The mechanism of air filtration in fibrous filter isAnswer: All of these If the packing density (α) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where Vis velocity in fluid void space and V₀ is undisturbed fluid velocity)Answer: V = V₀/(1 + α) For the turbulent flow, the dispersion coefficient is correlated as a function ofAnswer: Reynolds number In sterilization process, spore of which of the following organism is considered as control?Answer: Bacillus stearothermophilus Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where Jₙ is flux component 'n', cₙ is concentration of'n')Answer: Jₙ = -D dcₙ/dx The typical size of particles collected by diffusion mechanism isAnswer: <0.5μm The X₉₀ value for a filtration system isAnswer: the depth required to reduce population by 90%