Mechanical Operations problems
- 1. Which of the following represents the plot of filtrate volume versus time for constant pressure filtration?
Options- A. Parabola
- B. Straight line
- C. Hyperbola
- D. Exponential curve Discuss
Correct Answer: Parabola
- 2. For removal of very small amounts of precipitate from large volume of water, the most suitable filter is the __________ filter.
Options- A. plate & frame
- B. shell & leaf
- C. sand
- D. rotary vacuum Discuss
Correct Answer: sand
- 3. Mesh indicates the number of holes per
Options- A. square inch
- B. linear inch
- C. square foot
- D. linear foot Discuss
Correct Answer: linear inch
- 4. Colloid mills achieve size reduction mainly by
Options- A. impact
- B. attrition
- C. cutting
- D. compression Discuss
Correct Answer: attrition
- 5. A pebble mill
Options- A. is a ball mill.
- B. employs flints or ceramic pebbles as the grinding medium.
- C. is a tube mill lined with ceramic or other non-metallic liner.
- D. both (b) and (c). Discuss
Correct Answer: both (b) and (c).
- 6. Moisture can be removed from lubricating oil using
Options- A. tubular centrifuge
- B. clarifier
- C. sparkler filter
- D. vacuum leaf filter Discuss
Correct Answer: tubular centrifuge
- 7. The most common filter aid is
Options- A. diatomaceous earth
- B. calcium silicate
- C. sodium carbonate
- D. silica gel Discuss
Correct Answer: diatomaceous earth
- 8. Size reduction of asbestos and mica is done by
Options- A. hammer mills
- B. rod mills
- C. gyratory crushers
- D. crushing rolls Discuss
Correct Answer: hammer mills
- 9. For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.
Options- A. 10
- B. 25
- C. 50
- D. 75 Discuss
Correct Answer: 50
- 10. The speed of a rotary drum vacuum filter may be about __________ rpm.
Options- A. 1
- B. 50
- C. 100
- D. 500 Discuss
Correct Answer: 1
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