Related Mcqs:

1. 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

2. Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle)?

   A. 6.V/D.S
   B. V/6D.S
   C. D.S/V
   D. V/D.S

3. In a grinding operation, the limiting particle size is the size of the _______________ particle in the sample?

   A. Smallest
   B. Largest
   C. Either A. or B.
   D. Neither A. nor B.

4. The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an______________?

   A. Bag filter
   B. Electrostatic precipitator
   C. Cyclone separator
   D. Wet scrubber

5. A widely used size reduction equipment for ______________ is Bradford breaker?

   A. Talc
   B. Coal
   C. Iron core
   D. Wheat

6. For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a__________________?

   A. Buhrstone mill
   B. Ball mill
   C. Crushing rolls
   D. Hammer mill

7. The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ?

   A. Df/Dp
   B. Dp/Df
   C. Df – Dp
   D. None of these

8. Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?

   A. μ > tan α
   B. μ ≥ tan α
   C. μ > tan 2α
   D. μ ≤ tan α

9. Which of the following is not an industrial screening equipment ?

   A. Sharpies centrifuge
   B. Vibrating screen
   C. Grizzly
   D. Trommel

10. Which of the following is a batch sedimentation equipment ?

    A. Dust catcher
    B. Filter thickener
    C. Dry cyclone separator
    D. Rotary sprayer scrubber