A. > 1
B. < 1
C. 1
D. 2
Related Mcqs:
- For raschig rings, the sphericity is_____________________?
A. 0.5
B. 1
C. < 1
D. √3 - 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 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 - 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 - 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 - Shape factor for a cylinder whose length equals its diameter is_________________?
A. 1.5
B. 0.5
C. 1.0
D. 2.0 - Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?
A. 0.5 D
B. D
C. 1.5 D
D. 2 D - Reciprocal of sphericity is termed as the________________?
A. Specific surface ratio
B. Shape factor
C. Sauter diameter
D. Surface area per unit mass - Sphericity of pulverised coal is__________________?
A. 1
B. < 1
C. > 1
D. ∞
