A _______________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream?

Related Mcqs:

1. Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the___________________?

   A. Coagulation
   B. Flocculation
   C. Sedimentation
   D. Clarification

2. Higher is the mesh number, smaller will be the aperture size of the screen. It means that the aperture size of a 200 mesh screen will be smaller than that of 20 mesh screen. This is valid for__________________?

   A. British standard screens
   B. German standard screens (DIN 1171) etc
   C. American standard screens (ASTM and Tyler standard screens)
   D. All A., B. and C.

3. increasing the capacity of a screen _______________ the screen effectiveness?

   A. Decreases
   B. Increases
   C. Does not effect
   D. None of these

4. To remove dirt from the flowing fluid, we use a ____________________?

   A. Coagulant
   B. Gravity settler
   C. Strains
   D. Clarifier

5. The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is_________________?

   A. 1.5
   B. 1
   C. √2
   D. None of these

6. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?

   A. 0.50
   B. 0.58
   C. 0.68
   D. 0.62

7. Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of ____________ mm?

   A. 0.007
   B. 0.30
   C. 50
   D. 0.014

8. Screen capacity is proportional to (where, S = screen aperture)____________________?

   A. S
   B. 1/S
   C. S2
   D. √S

9. Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid ?

   A. Sand bed filter
   B. Plate and frame filter press
   C. Vacuum filter
   D. Batch basket centrifuge

10. Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called__________________?

    A. Classification
    B. Sedimentation
    C. Clarification
    D. Decantation