A. π = (A/D2)
B. π/6 = (V/D3)
C. AD/V
D. None of these
Related Mcqs:
- For spheres, volume shape factor is given by____________________?
A. π = (A/D2)
B. 2π = (2A/D2)
C. π/6 = (V/D3)
D. AD/V - For spheres, the specific surface shape factor is given by___________________?
A. AD/V
B. D/V
C. A/V
D. √(AD/V) - 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 - Shape factor for a cylinder whose length equals its diameter is_________________?
A. 1.5
B. 0.5
C. 1.0
D. 2.0 - Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?
A. P/m = K/ √Dp
B. P/m = K . ln D̅ sa/D̅ sb
C. P/m = K . (1/ D̅ sb – 1/D̅ sa)
D. None of these - 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 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 - 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 - Equivalent diameter of a particle is the diameter of the sphere having the same __________________?
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 - Sauter mean diameter is the same as the ______________ mean diameter?
A. Mass
B. Arithmetic
C. Volume-surface
D. Geometric
