Carbon black is pulverised in a_______________?

Related Mcqs:

1. Sphericity of pulverised coal is__________________?

   A. 1
   B. < 1
   C. > 1
   D. ∞

2. 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

3. Coal is finally pulverised to 200 mesh size for burning in boilers by a___________________?

   A. Hammer crusher
   B. Ball mill
   C. Roll crusher
   D. Gyratory crusher

4. Removal of activated carbon from glycerine is done by _________________?

   A. Plate and frame filter
   B. Rotary vacuum filter
   C. Batch basket centrifuge
   D. None of these

5. Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?

   A. 0.01 L.S
   B. 0.087 L.S
   C. L.S
   D. L.S/0.087

6. 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

7. Maximum size reduction in a ball mill is done by the, ______________ action?

   A. Attrition
   B. Compression
   C. Impact
   D. Cutting

8. The opening of a 200 mesh screen (Taylor series) is__________________?

   A. 0.0074 cm
   B. 0.0074 mm
   C. 0.0047 cm
   D. 74 milli-microns

9. Pick out the correct statement ?

   A. Plastic chips are called non-cohesive solids
   B. Kick’s crushing law is, P/m = K . ln (D̅ sa/D̅ sb)
   C. Communition is a generic term for size enlargement operation
   D. Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh
   screen, is called ‘Work index’

10. The unit of filter medium resistance is________________?

    A. cm-1
    B. gm/cm-1
    C. cm/gm-1
    D. gm-1