A. Maximum porosity at the upstream side
B. Maximum porosity at the filter medium
C. Same porosity throughout the cake thickness
D. None of these
Related Mcqs:
- With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge________________?
A. Increases
B. Decreases
C. Remains constant
D. Increases linearly - The specific cake resistance for compressible sludges is a function of the pressure drop__________________?
A. Over cake
B. Over medium
C. Overall
D. None of these - The porosity of a compressible cake is _____________________?
A. Minimum at the filter medium
B. Minimum at the upstream face
C. Maximum at the filter medium
D. Same throughout the thickness of cake - Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is_____________________?
A. 0.01 to 0.1
B. 0.1 to 0.3
C. 0.2 to 0.8
D. 0.2 to 0.4 - Compressibility co-efficient for an absolutely compressible cake is_______________?
A. 0
B. 1
C. 0 to 1
D. ∞ - The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)__________________?
A. ∝ ΔP
B. ∝ 1/ ΔP
C. ∝ √ΔP
D. Independent of ΔP - Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is_______________?
A. Added to the feed slurry
B. Pre-coated on the filter medium prior to filtration
C. Separated from the cake by dissolving solids or by burning it off
D. All A, B. & C. - Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate) ?
A. S
B. 1/R
C. 1/μ
D. All A., B. & C. - The basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?
A. 10
B. 20
C. 25
D. 30 - In case of a plate and frame filter press, filtrate flow through the cake follows _______________ flow?
A. Plug
B. Turbulent
C. Laminar
D. None of these
