The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be _______________ cms?

Related Mcqs:

1. As per Taggart’s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms) ?

   A. LS
   B. 93 LS
   C. 250 LS
   D. √(LS)

2. 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

3. 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

4. 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

5. 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

6. Feed size of ≥ 25 cms can be accepted by _______________________?

   A. Ball mill
   B. Rod mill
   C. Fluid energy mill
   D. Jaw crusher

7. 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

8. Sauter mean diameter is the same as the ______________ mean diameter?

   A. Mass
   B. Arithmetic
   C. Volume-surface
   D. Geometric

9. 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

10. 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