Mechanical Operations problems
- 1. Fluid medium used in the classification technique of mineral beneficiation is
Options- A. air
- B. water
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
Correct Answer: either (a) or (b)
- 2. Which of the following can be most effectively used for clarification of lube oil and printing ink?
Options- A. Sparkler filter
- B. Precoat filter
- C. Disc-bowl centrifuge
- D. Sharpies supercentrifuge Discuss
Correct Answer: Sharpies supercentrifuge
- 3. Weber number is significant and is concerned with the
Options- A. solid-liquid mixing.
- B. liquid-liquid mixing.
- C. dispersion of liquid in liquid.
- D. suspension of solid in liquid. Discuss
Correct Answer: dispersion of liquid in liquid.
- 4. Additives used for promoting the floccula-tion of particles is a/an
Options- A. electrolyte
- B. surface active agent
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 5. The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m2 V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.? = density of solids, kg/m3)
Options- A. 3.6 AVS.?
- B. 3.6 A.V.?
- C. 3.6 A.S. ?
- D. 3.6 AVS/? Discuss
Correct Answer: 3.6 AVS.?
- 6. The porosity of a compressible cake is
Options- 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. Discuss
Correct Answer: minimum at the filter medium.
- 7. Which of the following conveyors cannot be recommended for transportation of abrasive materials?
Options- A. Belt conveyor
- B. Apron conveyor
- C. Flight conveyor
- D. Chain conveyor Discuss
Correct Answer: Flight conveyor
- 8. The material is crushed in a gyratory crusher by the action of
Options- A. impact
- B. compression
- C. attrition
- D. cutting Discuss
Correct Answer: compression
- 9. In the cyclone separator used for separation of dust from dust laden gas, the gas
Options- A. enters the cyclone from the top.
- B. is admitted tangentially at high velocity.
- C. develops a helical motion inside the chamber.
- D. both (b) and (c). Discuss
Correct Answer: both (b) and (c).
- 10. In paint industries, blending of light paste is done by using a
Options- A. masticator
- B. charge can mixer
- C. kneader
- D. none of these Discuss
Correct Answer: charge can mixer
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