During the washing of cake_________________?

Related Mcqs:

1. During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?

   A. At time zero
   B. At the end of filtration
   C. When half the filtrate has been obtained
   D. At the end of filtration, but decreases with time subsequently

2. 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

3. All resistances during washing of cake _____________________?

   A. Increases
   B. Decreases
   C. Remain constant
   D. None of these

4. During agitation of liquids, power consumption during laminar flow is not proportional to the ________________?

   A. Density of the liquid
   B. Viscosity of the liquid
   C. Cube of impeller diameters
   D. Square of rotational speed

5. Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is________________?

   A. > 10
   B. < 10
   C. > 100
   D. < 100

6. During agitation of liquids, the_________________?

   A. Froude number is independent for the curves between power number and Reynolds number in
   baffled system
   B. Power number becomes independent of impellers Reynolds number at high Reynolds number,
   but is dependent on the geometry of the impeller
   C. Froude number is used to account for the effect of surface (e.g., the centre vortex) on the
   power number
   D. All A., B. and C.

7. Power consumption during turbulent flow in agitation tank is proportional to the ______________ of the liquid?

   A. Viscosity
   B. Thermal conductivity
   C. Surface tension
   D. Density

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

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

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. Temperature of the product during ultrafine grinding_____________________?

    A. Increases
    B. Decreases
    C. Remain constant
    D. May increase or decrease; depends on the material being ground