## Interview MCQ Set 1

1. Which of the following is not a classification of biological species?

a) Bio-molecules

b) Small molecules

c) Bio-Polymers

d) Cellular particulates

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2. What are primary metabolites?

a) Synthesized during primary phase of cell growth

b) Synthesized during secondary phase of cell growth

c) Synthesized during death phase of cell growth

d) Synthesized during growth phase of cell

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3. What are secondary metabolites?

a) Synthesized during primary phase of cell growth

b) Synthesized during secondary phase of cell growth

c) Synthesized during the stationary phase

d) Synthesized during growth phase of cell

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4. What is the molecular weight range of proteins?

a) 1000 DA- 10000 DA

b) 10000 Da- 100000 Da

c) 100000 Da-1000000 Da

d) 100000Da – 10000000 Da

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5. What are nucleotides?

a) Nitrogenous bases covalently bonded to triose sugar

b) Nitrogenous bases covalently bonded to quadrose sugar

c) Nitrogenous bases covalently bonded to pentose sugar

d) Nitrogenous bases covalently bonded to hexose sugar

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6. Which of the following is an incorrect difference between prokaryotic and eukaryotic cell?

a) Eukaryotic cell has a cell wall while prokaryotic does not

b) Eukaryotic cell has less developed nucleus than prokaryotic cells

c) Prokaryotic cell can be aerobic while eukaryotic cell is mostly anaerobic

d) Prokaryotic cell does not have membrane bound organelles while eukaryotic cell has membrane bound organelles

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7. If the bioproduct mass is 113Kg and the impurities are 500g, what is the purity of the bioproduct?

a) 99.12%

b) 99.55%

c) 0.004%

d) 98.68%

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8. If the mass fed to the separation process was 460Kg and the mass recovered was 422Kg, what is the % yield?

a) 93.77%

b) 8.2%

c) 91,73 %

d) 9%

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9. What is the purpose of solute- solute separations and what are the species removed?

a) Purpose: clarify target species; Removes: culture media, fermentation broth

b) Purpose: extract target from cells; removes: small molecules, proteins

c) Purpose: Preserve target species ; Removes: Buffer solutions

d) Purpose: Fractionate target species; Removes: unrelated solutes ,small molecules.

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10. What is the purpose of fluid-solid separations and what are the species removed?

a) Purpose: clarify target species; Removes: culture media, fermentation broth

b) Purpose: extract target from cells; removes: small molecules, proteins

c) Purpose: Preserve target species ; Removes: Buffer solutions

d) Purpose: Fractionate target species; Removes: unrelated solutes ,small molecules.

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11. Which of the following process is not employed to distinguish between contaminants and the product based on physiochemical features?

a) Filtration

b) Batch adsorption

c) Isoatachoporesis

d) Crystallization

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12. What is the overall percentage yield for penicillin manufacturing?

a) 20%

b) 30%

c) 40%

d) 50%

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13. Which of the following is also a process for penicillin recovery?

a) Adsorption on activated carbon

b) Direct crystallization

c) Degumming

d) Distillation

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14. What is the use of batch electrophoresis in procedure of purification of bioproduct?

a) It gives high resolution carbohydrates

b) It purifies completely

c) It gives high resolution protein content

d) The targeted product is concentrated by batch electrophoresis

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## Interview MCQ Set 2

1. What is the dominant use of ion exchange?

a) Water softening with gel resins

b) Separation of metals

c) Metallurgy

d) Extraction of metals

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2. If the interstitial velocity is 40 and the length is 40 units what is the time required for displacement?(assume SI units)

a) 1

b) 2

c) 3

d) 4

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3. If the interstitial velocity is 40 and the length is 80 units what is the time required for displacement?(assume SI units)

a) 1

b) 2

c) 3

d) 4

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4. If the interstitial velocity is 50 and the length is 60 units what is the time required for displacement?(assume SI units)

a) 1.5

b) 1.2

c) 6.5

d) 4.4

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5. If the interstitial velocity is 80 and the length is 20 units what is the time required for displacement?(assume SI units)

a) 0.25

b) 2

c) 3.5

d) 15

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6. If the interstitial velocity is 60 and the length is 80 units what is the time required for displacement?(assume SI units)

a) 1.7

b) 2.6

c) 1.33

d) 5.5

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7. If the interstitial velocity is 90 and the length is 40 units what is the time required for displacement?(assume SI units)

a) 1.33

b) 2.25

c) 7.6

d) 4.5

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8. If the interstitial velocity is 20 and the length is 40 units what is the time required for displacement?(assume SI units)

a) 1

b) 2

c) 3

d) 4

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9. If the interstitial velocity is 10 and the length is 40 units what is the time required for displacement?(assume SI units)

a) 1

b) 2

c) 3

d) 4

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10. If the interstitial velocity is 50 and the length is 40 units what is the time required for displacement?(assume SI units)

a) 0.5

b) 0.6

c) 0.8

d) 0.6

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## Interview MCQ Set 3

1. Many separators are cascades where two contacting phases flow __________

a) Co-currently

b) Counter-currently

c) Same direction

d) In any direction

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2. Why the approximate calculations of composition of input and output field are called group methods?

a) Because they are found only in groups

b) Because only input-output group is there

c) Because they deal only with input-output calculation and don’t consider what exactly happens

d) It’s just a name

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3. If K_{D} = 2, amount of solvent (V)= 100kg and amount of feed liquid is 300, what is the extraction factor?

a) 0.67

b) 1

c) 2

d) 3

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_{D}V/L, 2*100/300=0.67.

4. If K_{D} = 2, amount of solvent (V)= 200kg and amount of feed liquid is 300, what is the extraction factor?

a) 0.67

b) 1.3

c) 2.4

d) 3

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_{D}V/L, 2*200/300=1.33.

5. If K_{D} = 0.5, amount of solvent (V)= 100kg and amount of feed liquid is 300, what is the extraction factor?

a) 0.67

b) 1

c) 0.167

d) 3

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_{D}V/L, 0.5*100/300=0.167.

6. If K_{D} = 2, amount of solvent (V)= 100kg and amount of feed liquid is 100, what is the extraction factor?

a) 0.67

b) 1

c) 2

d) 3

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_{D}V/L, 2*100/100=2.

7. If K_{D} = 0.5, amount of solvent (V)= 500kg and amount of feed liquid is 300, what is the extraction factor?

a) 0.67

b) 1.33

c) 2

d) 0.833

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_{D}V/L, 0.5*500/300=0.833.

8. If K_{D} = 3, amount of solvent (V)= 100kg and amount of feed liquid is 300, what is the extraction factor?

a) 0.67

b) 1

c) 2

d) 3

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_{D}V/L, 3*100/300=1.

9. If K_{D} = 2.5, amount of solvent (V)= 100kg and amount of feed liquid is 100, what is the extraction factor?

a) 0.67

b) 1

c) 2.5

d) 3

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_{D}V/L, 2*100/300=0.67.

10. If K_{D} = 1, amount of solvent (V)= 100kg and amount of feed liquid is 300, what is the extraction factor?

a) 0.67

b) 1

c) 1.33

d) 0.33

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_{D}V/L, 1*100/300=0.33.

## Interview MCQ Set 4

1. Which model is used for predicting liquid-phase activity coefficients?

a) Entropy models

b) Enthalpy models

c) Gibb’s free equation model

d) Keller model

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2. The relationship between excess molar free energy and excess molar enthalpy is:

a) G^{E} = h^{E} – TS^{E}

b) G^{E} = h^{E} + TS^{E}

c) G^{E} = – TS^{E}

d) G^{E} = h^{E} – T

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^{E}= h

^{E}– TS

^{E}.

3. For a regular solution model what is the excess molar free enrgy dependent upon?

a) Volume occupied by molecules

b) Interaction of molecules

c) Molecular size and intermolecular forces

d) Enthalpy of formation of molecules

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4. Non-ideal solution effects can be incorporated in K-value formulations by:

a) Integrating for each molecule

b) Use of excess free energy

c) Use of enthalpy of vaporization

d) Use of partial fugacity coefficient ϕ_{i}

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_{i}.

5. In Margules equation, what is the one constant form equivalent to?

a) Unsymmetrical activity coefficient curves

b) Symmetrical activity coefficient curves

c) Similar partial fugacity coefficients

d) Dissimilar partial fugacity coefficients

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6. What is the temperature dependence of van laar constant?

a) A_{ij} = A’_{ij}/T

b) A_{ij} = A’_{ij}R/T

c) A_{ij} = A’_{ij}/TR

d) A_{ij} = A’_{ij}*RT

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_{ij}= A’

_{ij}/TR is the value of Van Laar constant.

7. When is Wilson’s equation superior to Margules and Van laar equation?

a) Non-ideal and immiscible mixtures

b) Ideal and miscible mixtures

c) Non-ideal and miscible mixtures

d) Ideal and immiscible mixtures.

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8. What is the full form of NRTL model?

a) No rational two liquid model

b) Non-random three liquid model

c) Non-random two liquid model

d) Non-Rating two liquid model

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9. How does the UNIQUAC model help?

a) It helps to place calculations of activity coefficients on practical basis

b) It helps to place calculations of activity coefficients on theoretical basis

c) It helps to place calculations of activity coefficients from graph

d) It helps to provide a easier way to place calculations

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10. What must be true for two coexisting liquid phases?

a) Y_{iL}^{(1)}x_{i}^{(1)} = Y_{iL}^{(2)}x_{i}^{(2)}

b) Y_{iL}^{(1)}x_{i}^{(1)} = x_{i}^{(2)}

c) Y_{iL}^{(1)}x_{i}^{(1)}= Y_{iL}^{(2)}y_{i}^{(2)}

d) Y_{iL}^{(1)}x_{i}^{(1)} = X_{iL}^{(2)}x_{i}^{(2)}

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_{iL}

^{(1)}xi(1) = Y

_{iL}

^{(2)}x

_{i}

^{(2)}must hold true.

## Interview MCQ Set 5

1. What is the goal of distillation?

a) To produce a distillate rich in light key and the bottoms product rich in high key

b) To produce a distillate rich in high key and the bottoms product rich in light key

c) To produce a distillate rich in light key and the bottoms product rich in light key

d) To produce a distillate rich in high key and the bottoms product rich in high key

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2. What is meant by light key (LK)?

a) A feed that contains less volatile components

b) A feed that has less mass

c) A feed that has higher concentration of less molecular weight solute

d) A feed that contains more volatile components

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3. What is meant by high key (HK)?

a) A feed that contains less volatile components

b) A feed that has less mass

c) A feed that has higher concentration of less molecular weight solute

d) A feed that contains more volatile components

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4. If LK=1 and HK=2, what is the formula for α _{1,2} ?

a) α _{1,2} =K1/K2

b) α _{1,2} =K1*K2

c) α _{1,2} =K1-K2

d) α _{1,2} =K1+K2

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_{1,2}=K1/K2.

5. For what value of α1,2 ,the separation cannot be achieved?

a) 0.8

b) 1.2

c) 1.3

d) 1.8

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_{1,2}= 0.8, the separation cannot be achieved since its value has to be greater than 1.Thus by further increasing pressure, separation cannot be achieved.

6. What is the formula for distillation rate according to mcCabe-thiele’s method?

a) D= F(z _{F} – x _{B} )/(x _{D} + x _{B} )

b) D= F(z _{F} – x _{B})/(x _{D} /x _{B} )

c) D= F(z _{F} – x _{D} )/(x _{D} – x _{B} )

d) D= F(z _{F} – x _{B} )/(x _{D} – x _{B} )

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_{F}– x

_{B})/(x

_{D}– x

_{B}) is the correct equation where D is the distillation rate, F is the total feed rate, z F is the mole fraction of LK in feed, x

_{D}, x

_{B}are mole fractions of LK in distillate and bottom.

7. What is the distillation rate if feed rate is 4moles/s and mole fraction of LK in feed is 0.7, and mole fraction of LK in distillate and bottom is 0.5, 0.4?

a) 8moles/s

b) 12moles/s

c) 16moles/s

d) 20moles/s

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_{F}– x

_{B})/(x

_{D}– x

_{B}), D=4*(0.7-0.4)(0.5- 0.4)=12.

8. What is the distillation rate if feed rate is 20moles/s and mole fraction of LK in feed is 0.8, and mole fraction of LK in distillate and bottom is 0.5, 0.4?

a) 80moles/s

b) 12moles/s

c) 16moles/s

d) 20moles/s

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_{F}– x

_{B})/(x

_{D}– x

_{B}), D=20*(0.8-0.4)(0.5- 0.4)=80.

9. What is the distillation rate if feed rate is 9moles/s and mole fraction of LK in feed is 0.7, and mole fraction of LK in distillate and bottom is 0.5, 0.3?

a) 45moles/s

b) 16moles/s

c) 18moles/s

d) 20moles/s

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_{F}– x

_{B})/(x

_{D}– x

_{B}), D=9*(0.7-0.3)(0.5- 0.3)=18.

10. What is the distillation rate if feed rate is 31moles/s and mole fraction of LK in feed is 0.9, and mole fraction of LK in distillate and bottom is 0.6, 0.4?

a) 23moles/s

b) 26moles/s

c) 28moles/s

d) 31moles/s

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_{F}– x

_{B})/(x

_{D}– x

_{B}), D=31*(0.9-0.4)(0.6- 0.4)=12.