Throughout the cake washing stage_________________?
Show answer Hide answer
Answer: A. All the resistances are constant
Explanation
Once a filter cake is fully formed, its thickness and structure remain constant. Flow rate and pressure drop are held steady during the washing phase. Consequently, filter medium and cake resistances do not change throughout washing. Cake washing involves passing a wash liquid through the pre-formed filter cake. Filtration resistance equations treat the established cake as a fixed porous bed. Maintaining steady operating conditions prevents cake cracking and channeling.
Understanding resistance stability helps operators calculate wash liquid requirements. Constant resistance ensures predictable washing times in automated industrial filters. Preventing cake disturbance ensures all trapped impurities are thoroughly rinsed out. Option b is false because filter medium resistance remains steady once cake is formed. Option c is incorrect as medium resistance does not decrease during the wash phase. Option d is wrong because compacted cake resistance stays constant without further compression.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Throughout any filtration procedure, the filtrate must work its way against the resistance of the ___________________?
Show answer Hide answer
Answer: D. All A., B. and C.
Slurry must flow through inlet channels before ever reaching the filter medium. As solids accumulate, the growing filter cake adds significant hydraulic resistance. The filter cloth or septum itself presents inherent res...
Q2. Electrostatic precipitators can achieve dust collection efficiencies as high as 99.9%, with maximum gas operating temperatures and pressures respectively at ?
Show answer Hide answer
Answer: B. 1000°C and 10 atm
Industrial electrostatic precipitators withstand extreme flue gas environments reliably. Specialized high-temperature designs operate effectively up to one thousand degrees Celsius. Robust pressure containment allows saf...
Q3. The equivalent diameter of an irregular particle corresponds to the diameter of a sphere possessing identical __________________?
Show answer Hide answer
Answer: A. Ratio of surface to volume as the actual volume
Equivalent spherical diameter can be defined based on matching specific surface-to-volume ratios. Non-spherical irregular particles share specific surface characteristics with this equivalent sphere. Matching surface-to-...
Q4. Filter medium resistance plays a critical role during the ______________ phase of filtration?
Show answer Hide answer
Answer: A. Early stages
Filter medium resistance dominates at the very beginning before solids deposit. Once initial layers of solids form, cake resistance quickly surpasses medium resistance. The clean cloth provides flow restriction mainly du...
Q5. Filter aids are incorporated in order to____________________?
Show answer Hide answer
Answer: C. Increase the porosity of the cake
Filter aids are incompressible porous particles added to create open interstitial channels. These channels increase the overall porosity and permeability of the filter cake. Higher porosity reduces cake resistance and in...
Q6. The filtration capacity of a rotary drum vacuum filter is a function of the_______________?
Show answer Hide answer
Answer: C. Both A. & B.
Rotary drum vacuum filter capacity depends directly on resulting cake thickness per cycle. Feed slurry characteristics like solids concentration and viscosity dictate filtration rates. Both factors govern the overall mas...