Mechanical Operations MCQ in Chemical Engineering - Set 23 - ObjectiveBooks

Mechanical Operations MCQ in Chemical Engineering - Set 23

Practice Test: Question Set - 23

1. Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.
    (A) Metalliferous ores
    (B) Non-metallic ores
    (C) Basic slags
    (D) Asbestos & mica

2. A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is
    (A) 0.1
    (B) 0.4
    (C) 0.6
    (D) None of these

3. Handling of ashes and similar materials can be done best by a __________ conveyor.
    (A) Flight
    (B) Drag or slat
    (C) Belt
    (D) Ribbon

4. Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.
    (A) Viscosity
    (B) Thermal conductivity
    (C) Surface tension
    (D) Density

5. Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher?
    (A) Rod mill
    (B) Fluid energy mill
    (C) Gyratory crusher
    (D) Ball mill

6. 200 mesh screen means 200 openings per
    (A) cm2
    (B) cm
    (C) inch
    (D) inch2

7. Which of the following terminology is not used for size reduction of materials to fine sizes or powders?
    (A) Comminution
    (B) Dispersion
    (C) Pulverization
    (D) Compression

8. A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is
    (A) 0.90 μm/s
    (B) 1 μm/s
    (C) 22.1 μm/s
    (D) 0.02 μm/s

9. The porosity of a compressible cake is
    (A) Minimum at the filter medium
    (B) Minimum at the upstream face
    (C) Maximum at the filter medium
    (D) Same throughout the thickness of cake

10. 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

11. The most common filter aid is
    (A) Diatomaceous earth
    (B) Calcium silicate
    (C) Sodium carbonate
    (D) Silica gel

12. Compressibility co-efficient for an absolutely compressible cake is
    (A) 0
    (B) 1
    (C) 0 to 1

13. __________ mill is normally used for grinding of talc.
    (A) Tube
    (B) Compartment
    (C) Ring-roll
    (D) Pebble

14. Which of the following is not an ultrafine grinder (colloid mill)?
    (A) Micronizers
    (B) Agitated mills and fluid energy mills
    (C) Toothed roll crusher
    (D) Hammer mills with internal classification

15. For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.
    (A) 10
    (B) 25
    (C) 50
    (D) 75

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