Mechanical Operations problems
- 1. In case of a ball mill,
Options- A. coarse feed requires a larger ball.
- B. fine feed requires a larger ball.
- C. operating speed should be more than the critical speed.
- D. none of these Discuss
Correct Answer: coarse feed requires a larger ball.
- 2. Pine oil used in froth floatation technique acts as a/an
Options- A. collector
- B. modifier
- C. frother
- D. activator Discuss
Correct Answer: frother
- 3. 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
Correct Answer: N2
- 4. Fibrous material is broken by a
Options- A. rollcrusher
- B. squirrel-cage disintegrator
- C. ball mill
- D. tube mill Discuss
Correct Answer: squirrel-cage disintegrator
- 5. Grindability of a material does not depend upon its
Options- A. elasticity
- B. hardness
- C. toughness
- D. size Discuss
Correct Answer: size
- 6. Dust laden air can be purified using a
Options- A. cyclone separator
- B. bag filter
- C. gravity settler
- D. tubular centrifuge Discuss
Correct Answer: cyclone separator
- 7. 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
Correct Answer: surface energy created by crushing to the energy absorbed by the solid.
- 8. 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
Correct Answer: 0.087 L.S
- 9. Feed size of ? 25 cms can be accepted by
Options- A. ball mill
- B. rod mill
- C. fluid energy mill
- D. jaw crusher Discuss
Correct Answer: jaw crusher
- 10. For transporting pasty material, one will use a/an
Options- A. apron conveyor
- B. belt conveyor
- C. screw colaveyor
- D. bucket elevator Discuss
Correct Answer: screw colaveyor
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