Discussion
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- Question
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
- Correct Answer
- <10
- 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
- 2. For transporting pasty material, one will use a/an
Options- A. apron conveyor
- B. belt conveyor
- C. screw colaveyor
- D. bucket elevator Discuss
- 3. Feed size of ? 25 cms can be accepted by
Options- A. ball mill
- B. rod mill
- C. fluid energy mill
- D. jaw crusher Discuss
- 4. Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm)
Options- A. 0.01 L.S
- B. 0.087 L.S
- C. L.S
- D. L.S/0.087 Discuss
- 5. Crushing efficiency is the ratio of the
Options- A. surface energy created by crushing to the energy absorbed by the solid.
- B. energy absorbed by the solid to that fed to the machine.
- C. energy fed to the machine to the surface energy created by crushing.
- D. energy absorbed by the solid to the surface energy created by crushing. Discuss
- 6. __________ are used for the separation of coarse particles from a slurry of fine particles.
Options- A. Thickeners
- B. Classifiers
- C. Hydrocyclones
- D. Decanters Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. Moore filter is a __________ filter.
Options- A. leaf
- B. press
- C. rotary
- D. sand Discuss
Mechanical Operations problems
Search Results
Correct Answer: Bucket elevators
Correct Answer: screw colaveyor
Correct Answer: jaw crusher
Correct Answer: 0.087 L.S
Correct Answer: surface energy created by crushing to the energy absorbed by the solid.
Correct Answer: Classifiers
Correct Answer: calls for relatively less energy for the smaller product particles, than does the Rittinger law.
Correct Answer: 1.5
Correct Answer: Rotary disc filter
Correct Answer: leaf
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