Which of the following represents the plot of filtrate volume versus time for constant pressure 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. A straight line is obtained on plotting reciprocal of filtration rate vs. the volume of filtrate for _______________ flow of filtrate?

   A. Compressible cakes and laminar
   B. Incompressible cake and laminar
   C. Compressible cake and turbulent
   D. Incompressible cake and turbulent

3. 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

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. 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

6. 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

7. 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)

8. During filtration operation, the filtrate encounters the resistance of the ___________________?

   A. Filter medium
   B. Cake
   C. Channel carrying the slurry to the upstream side of the cake and filtrate away from the filter
   medium
   D. All A., B. and C.

9. 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.

10. 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