Related Mcqs:

1. Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the ___________________?

   A. Light metal powder down upto 4 mesh size
   B. Dry chemicals
   C. Heavy tonnages of rocks or gravel
   D. Powdered food & granular materials

2. If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the __________________?

   A. Sedimentation
   B. Flocculation
   C. Dispersion
   D. Centrifugation

3. 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

4. Specific surface area is the surface area of a unit _______________ of materials?

   A. Weight
   B. Volume
   C. Either A. or B.
   D. Neither A. nor B.

5. Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called__________________?

   A. Classification
   B. Froth floatation
   C. Thickening
   D. Clarification

6. Solid particles of different densities are separated by _____________________?

   A. Filters
   B. Thickness
   C. Cyclones
   D. Sorting classifier

7. Separation of solid particles based on their densities is called_________________?

   A. Sizing
   B. Sorting
   C. Clarification
   D. Dispersion

8. Grizzlies are used for separating _____________ solids?

   A. Coarse
   B. Fine
   C. Any size
   D. None of these

9. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of_____________________?

   A. Electromagnets
   B. Cams or eccentric shafts
   C. Unbalanced flywheels
   D. Either A., B. or C.

10. Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?

    A. Sphere
    B. Cube
    C. Cylinder (L/D = 1)
    D. Raschig rings