The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant ______________ filtration?

Related Mcqs:

1. 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...

2. 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....

3. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface?

   A. Plane B. Curved C. Ribbed D. Either A. or B....

4. 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....

5. Flow of filtrate through the cake in a plate and frame filter press is best described by the ______________ equation?

   A. Kozeny-Carman B. Hagen-Poiseuille’s C. Fanning’s D. Kremser...

6. Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm < < Rc) is proportional to ____________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance)?

   A. √μ B. 1/√μ C. 1/μ D. 1/μ2...

7. 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...

8. Shell and leaf filter as compared to plate and frame filter _____________________?

   A. Entails less labor cost B. Facilitates filtration under higher pressure C. Provides more effective washing D. All A., B. & C....

9. A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is ___________________?

   A. ½w2 . R2 . ρL B. ½w2 . δ2 . ρL C. ½w2 . δρL (2R + δ) D. ½w2 . R . ρL(R + 2δ)...

10. Addition of filter aid to the slurry before filtration is done to _______________ of the cake?

    A. Increase the porosity B. Increase the compressibility co-efficient C. Decrease the porosity D. Decrease the compressibility co-efficient...