During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of 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. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is__________________?

   A. 4 B. 1/4 C. 1 D. 1/2...

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

   A. Rate B. Pressure C. Both A. & B. D. Neither A. nor B....

5. The filtrate flow rate in constant pressure filtration___________________?

   A. Continuously increases B. Continuously decreases C. Remain constant throughout D. May increase or decrease; depends on the pressure...

6. 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)...

7. Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the _____________ filtration?

   A. Constant rate B. Varying pressure C. Varying rate D. Constant pressure...

8. In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the__________________?

   A. Square root of the velocity B. Square of the viscosity C. Filtration time only D. Washing time only...

9. Filter medium resistance is important during the ______________ of filtration?

   A. Early stages B. Final stages C. Entire process D. None of these...

10. 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....