A. Ratio of surface to volume as the actual volume
B. Ratio of volume to surface as the particle
C. Volume as the particle
D. None of these
Related Mcqs:
- 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 - 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 - 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 - 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. - For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter D. as_________________?
A. d
B. √d
C. d2
D. 1/d - The specific surface of spherical particles is proportional to (where, Dp = diameter of particle)?
A. D2
B. Dp
C. 1/Dp
D. 1/D2p - The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?
A. 6/D.ρ
B. 2/D.ρ
C. 4/D.ρ
D. 12/D.ρ - Velocity of a small particle of diameter ‘Dp’ at a distance ‘r’ from the rotational axis of a cyclone rotating at an angular speed ‘ω’ is given by (the other symbols are as per standard notation) ?
A. [(DP/18). (ρs – ρ/μ)] ω2r
B. [(DP2/18). (ρs – ρ/μ)] ω2r
C. [(DP/18). (ρs – ρ/μ)] ω2r2
D. [(DP2/18). (ρs – ρ/μ)] ω2r - The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?
A. 20
B. 12
C. 8
D. 2
