Note s4

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text about Filter Aids:

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1. What is the primary function of a filter aid?
A. Increase pore size of the filter medium
B. Reduce the resistance to flow caused by solid accumulation
C. Enhance the chemical reaction in filtration
D. Decrease the porosity of the filter cake
Answer: B

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2. What happens to the resistance to flow as a solid layer builds up on the filter medium?
A. It remains constant
B. It decreases
C. It increases
D. It fluctuates randomly
Answer: C

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3. Which type of solids offer higher resistance to flow?
A. Flocculated solids
B. Solids with high porosity
C. Poorly flocculated solids
D. Soluble solids
Answer: C

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4. In cake filtration, how does the rate vary?
A. Linearly with volume
B. Independently of volume
C. With the square of the volume of liquid
D. With the cube of the volume
Answer: C

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5. What may happen when the volume of filter cake solids per unit volume of filtrate is low?
A. Filter medium becomes more porous
B. Solids penetrate void spaces, increasing resistance
C. Flow rate increases significantly
D. Filtration stops immediately
Answer: B

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6. At high concentrations of solids, which phenomenon is more likely?
A. Dissolution of solids
B. Blinding of the openings
C. Bridging over of openings
D. Complete removal of solids
Answer: C

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7. What happens to the filter medium over time with the accumulation of solids?
A. It becomes clearer
B. It becomes more absorbent
C. It becomes plugged or slimy
D. It remains unaffected
Answer: C

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1. How does a filter aid ideally act during filtration?
A. By dissolving solids in the liquid
B. By plugging the filter medium
C. By forming a fine surface deposit that screens out solids
D. By compressing the filter cake
Answer: C

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2. What type of cake does a filter aid usually form?
A. Compressible and dense
B. Porous and non-compressible
C. Slimy and absorbent
D. Impervious and brittle
Answer: B

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3. Which of the following factors influence the filtration cycle and clarity?
A. Pressure and temperature only
B. Time and volume of filtrate only
C. Density, type, particle size, and quantity of filter aid
D. Concentration of solids only
Answer: C

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4. What happens if too little filter aid is used?
A. Filtration becomes faster
B. The resistance of the filter cake increases
C. The cake becomes thinner
D. Solids are completely removed
Answer: B

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5. What is the result of using too much filter aid?
A. Improves filtration speed
B. Reduces cake thickness
C. Adds thickness without improving porosity
D. Completely eliminates resistance
Answer: C

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6. How are filter aids typically selected?
A. Based on standard values
B. Through computer simulation
C. By trial and error in lab or plant
D. From a universal filter aid list
Answer: C
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1. What are the two main goals when selecting a filter aid in general applications?
A. Low cost and chemical reactivity
B. Acceptable filtrate and highest flow rate
C. Bright color and fast mixing
D. Maximum thickness and low porosity
Answer: B
2. In pharmaceutical operations, which type of filter aid is usually preferred?
A. Coarse grades with high flow rates
B. Fine grades with low flow rates
C. Absorbent types with color retention
D. Cheap and reactive types
Answer:

3. What is the most important factor for a filter aid in pharmaceutical use?
A. Absorbency
B. Reactivity
C. Inertness
D. Color
Answer: C

4. What can be a negative effect of using highly absorbent filter aids?
A. They increase filtration speed too much
B. They prevent solid separation
C. They may remove desired colored substances and active ingredients
D. They clog the filter instantly
Answer: C

5. Even if the total quantity of an ingredient absorbed by the filter aid is small, why might this be significant?
A. It can cause the cake to collapse
B. It may represent a large proportion of the original concentration
C. It improves the appearance of the filtrate
D. It increases the medium’s porosity
Answer: B

34 viewsedited 02:42