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- Question
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.
- Correct Answer
- surface energy created by crushing to the energy absorbed by the solid.
- 1. Dust laden air can be purified using a
Options- A. cyclone separator
- B. bag filter
- C. gravity settler
- D. tubular centrifuge Discuss
- 2. Grindability of a material does not depend upon its
Options- A. elasticity
- B. hardness
- C. toughness
- D. size Discuss
- 3. Fibrous material is broken by a
Options- A. rollcrusher
- B. squirrel-cage disintegrator
- C. ball mill
- D. tube mill Discuss
- 4. The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
Options- A. N°
- B. N1
- C. N2
- D. N3 Discuss
- 5. Pine oil used in froth floatation technique acts as a/an
Options- A. collector
- B. modifier
- C. frother
- D. activator Discuss
- 6. 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
- 7. Feed size of ? 25 cms can be accepted by
Options- A. ball mill
- B. rod mill
- C. fluid energy mill
- D. jaw crusher Discuss
- 8. For transporting pasty material, one will use a/an
Options- A. apron conveyor
- B. belt conveyor
- C. screw colaveyor
- D. bucket elevator Discuss
- 9. 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
- 10. 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
Mechanical Operations problems
Search Results
Correct Answer: cyclone separator
Correct Answer: size
Correct Answer: squirrel-cage disintegrator
Correct Answer: N2
Correct Answer: frother
Correct Answer: 0.087 L.S
Correct Answer: jaw crusher
Correct Answer: screw colaveyor
Correct Answer: Bucket elevators
Correct Answer: <10
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