A. 1
B. < 1
C. > 1
D. ∞
Related Mcqs:
- 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 - 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 - 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 - Sphericity of raschig ring (whose length and diameter are equal) is___________________?
A. > 1
B. < 1
C. 1
D. 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 - Reciprocal of sphericity is termed as the________________?
A. Specific surface ratio
B. Shape factor
C. Sauter diameter
D. Surface area per unit mass - The sphericity of a solid particle of cubical shape is ___________________?
A. π
B. (π/6)1/3
C. (π/6)1/2
D. π/3 - The sphericity of a cylinder of 1 mm diameter and length 3 mm is_________________?
A. 0.9
B. 0.78
C. 0.6
D. 0.5 - If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is φs is defined by________________?
A. φs = 6 Vp/dpsp
B. φs = Vp/dpsp
C. φs = 6 dpSp/Vp
D. φs = dpSp/Vp - Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is ________________ ?
A. 0.5
B. 1
C. √2
D. √3
