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- Question
Which of the following chemical is sometime added in the process of coagulation and flocculation?
Options- A. Aluminum sulphate
- B. Aluminum oxide
- C. Calcium chloride
- D. None of these
- Correct Answer
- Aluminum sulphate
- 1. Permanent hardness of water is caused by the presence of
Options- A. bicarbonates of calcium and magnesium
- B. carbonates of sodium and potassium
- C. chlorides and sulfates of calcium and magnesium
- D. phosphates of sodium and potassium Discuss
- 2. Assuming the laminar flow across the filter, the rate of filtration (dVf/dt) can be expressed as a function of pressure drop Dp by the modified D'Arcy's equation as (where A is the area of filtering surface, K is the D'Arcy's filter cake permeability and L is the thickness of the filter cake)
Options- A. (1/A) dVf/dt = ?p/?(L/K)
- B. dVf/dt = (1/A)?p/?(L/K)
- C. (1/A) dVf/dt = ?p/? LK
- D. dVf/dt = (1/A)?p/? LK Discuss
- 3. Application of quaternary ammonium compounds as sanitizing agents tends to
Options- A. favor gram positive bacteria
- B. decrease gram positive bacteria
- C. increase the percentage of gram(-)ve rods on utensils
- D. none of the above Discuss
- 4. Penetration theory assumes that turbulent eddies travel from the bulk of the phase to the interface where they remain constant for a constant exposure time (te). The model correlating KL, mass transfer coefficient and DAB, diffusivity can be expressed as
Options- A. KL = 2(DAB/?te)0.25
- B. KL = 2(DAB/?te)0.5
- C. KL = 2(DAB/?te)0.75
- D. KL = 2(DAB/?te) Discuss
- 5. The enzyme inhibition can occur by
Options- A. reversible inhibitors
- B. irreversible inhibitors
- C. Both (a) and (b)
- D. None of these Discuss
- 6. The rate-determining step of Michaelis Menten kinetics is
Options- A. the complex formation step
- B. the complex dissociation step to produce product
- C. the product formation step
- D. Both (a)and(c) Discuss
- 7. For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its
Options- A. larger heat transfer area
- B. smaller heat transfer area
- C. lesser cost
- D. more number of plates Discuss
- 8. Why vortexing is undesirable in the agitation of biological systems?
Options- A. The collision between the cells, impeller and air bubbles will lead to cell damage
- B. Poor mixing despite the use of high stirrer speeds
- C. Mixing will not be in the turbulent region
- D. All of the above Discuss
- 9. Which of the enzyme combination is commercially used for the removal of oxygen?
Options- A. Glucose oxidase-cellulase
- B. Glucose oxidase-catalase
- C. Glucose oxidase-lactase
- D. All of these Discuss
- 10. The radius of the filter with a depth of 14 cm required for a volumetric airflow rate of 10 m3/min is approximately
Options- A. 1.6 m
- B. 0.6 m
- C. 3
- D. 6 m Discuss
More questions
Correct Answer: chlorides and sulfates of calcium and magnesium
Correct Answer: (1/A) dVf/dt = ?p/?(L/K)
Correct Answer: increase the percentage of gram(-)ve rods on utensils
Correct Answer: KL = 2(DAB/?te)0.5
Correct Answer: Both (a) and (b)
Correct Answer: the complex dissociation step to produce product
Correct Answer: larger heat transfer area
Correct Answer: All of the above
Correct Answer: Glucose oxidase-catalase
Correct Answer: 0.6 m
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