Mechanical Operations problems
- 1. Which of the follwoing mechanical conveyors does not come under the division 'scrapers'?
Options- A. Ribbon conveyor
- B. Flight conveyor
- C. Bucket elevators
- D. Drag conveyor. Discuss
Correct Answer: Bucket elevators
- 2. Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is
Options- A. >10
- B. <10
- C. >100
- D. <100 Discuss
Correct Answer: <10
- 3. __________ are used for the separation of coarse particles from a slurry of fine particles.
Options- A. Thickeners
- B. Classifiers
- C. Hydrocyclones
- D. Decanters Discuss
Correct Answer: Classifiers
- 4. Bond crushing law
Options- A. calls for relatively less energy for the smaller product particles, than does the Rittinger law.
- B. is less realistic in estimating the power requirements of commercial crushers.
- C. states that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product.
- D. states that the work required for the crushing is proportional to the new surface created. Discuss
Correct Answer: calls for relatively less energy for the smaller product particles, than does the Rittinger law.
- 5. General crushing equation is given by
. Bond's crushing law isobtained by solving this equation for n = __________ and feed of infinite size.
Options- A. 1
- B. 1.5
- C. 2
- D. 2.5 Discuss
Correct Answer: 1.5
- 6. Which of the following is a vacuum filter?
Options- A. Filter press
- B. Rotary disc filter
- C. Batch basket centrifuge
- D. Tank filter (Nutsch filter) Discuss
Correct Answer: Rotary disc filter
- 7. Moore filter is a __________ filter.
Options- A. leaf
- B. press
- C. rotary
- D. sand Discuss
Correct Answer: leaf
- 8. Shape factor for a cylinder whose length equals its diameter is
Options- A. 1.5
- B. 0.5
- C. 1.0
- D. 2.0 Discuss
Correct Answer: 1.5
- 9. The operating speed of a ball mill should be __________ the critical speed.
Options- A. less than
- B. much more than
- C. at least equal to
- D. slightly more than Discuss
Correct Answer: less than
- 10. Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.
Options- A. filtering
- B. washing
- C. drying
- D. all (a), (b) & (c) Discuss
Correct Answer: all (a), (b) & (c)
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