Mechanical Operations problems
- 1. The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size )
Options- A. c/s
- B. s/c
- C. s . c
- D. 1/s . c Discuss
Correct Answer: c/s
- 2. Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
Options- A. easier grindability
- B. poor grindability
- C. high power consumption in grinding
- D. none of these Discuss
Correct Answer: easier grindability
- 3. Flow of filtrate through the cake in a plate and frame filter press is best described by the __________ equation.
Options- A. Kozney-Karman
- B. Hagen-Poiseulle's
- C. Fanning's
- D. Kremser Discuss
Correct Answer: Kozney-Karman
- 4. Energy consumed for crushing one ton of material ranges from __________ kWh.
Options- A. 0.01 to 0.1
- B. 0.5 to 1.5
- C. 2 to 3.5
- D. 4 to 5. Discuss
Correct Answer: 0.5 to 1.5
- 5. Use of baffles in agitators help in minimising the __________ tendency.
Options- A. swirling
- B. vortexing
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 6. The crushed material received for separation is called feed or
Options- A. tailing
- B. heading
- C. concentrate
- D. middling Discuss
Correct Answer: heading
- 7. The most suitable equipment for removing the fine dust particle (< 1 micron dia.) from air below its dew point will be a/an
Options- A. bag filter
- B. electrostatic precipitator
- C. cyclone separator
- D. wet scrubber Discuss
Correct Answer: electrostatic precipitator
- 8. Cement clinker is reduced to fine size by a
Options- A. roll crusher
- B. ball mill
- C. tube mill
- D. hammer mill Discuss
Correct Answer: tube mill
- 9. Ball mill is used for
Options- A. crushing
- B. coarse grinding
- C. fine grinding
- D. attrition Discuss
Correct Answer: fine grinding
- 10. __________ mixer is used for devulcanisation of rubber scrap & making water dispersion & rubber solution.
Options- A. Tumbler
- B. Banbery
- C. Muller
- D. Rubbon blender Discuss
Correct Answer: Banbery
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