logo

CuriousTab

CuriousTab

Discussion


Home Chemical Engineering Mechanical Operations Comments

  • Question
  • In case of a hammer crusher,


  • Options
  • A. crushing takes place by impact breaking.
  • B. maximum acceptable feed size is 30 cms.
  • C. reduction ratio can be varied by adjusting the distance from cage to hammers.
  • D. all (a), (b) and (c).

  • Correct Answer
  • all (a), (b) and (c). 


  • Mechanical Operations problems


    Search Results


    • 1. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

    • Options
    • A. 4
    • B. 1/4
    • C. 1
    • D. 1/2
    • Discuss
    • 2. Which of the following is not categorised as a "mechanical operation"?

    • Options
    • A. Agitation
    • B. Filtration
    • C. Size enlargement
    • D. Humidification
    • Discuss
    • 3. Balls for ball mills are never made of

    • Options
    • A. forged/cast steel
    • B. lead
    • C. cast iron
    • D. alloy steel
    • Discuss
    • 4. Froth floatation is the most suitable for treating

    • Options
    • A. iron ores
    • B. sulphide ores
    • C. quartzite
    • D. none of these
    • Discuss
    • 5. Pick out the correct statement:

    • Options
    • A. Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
    • B. The operating cost of shaking screen is more than that of a vibrating screen.
    • C. Screen capacity does not depend upon the specific gravity of the minerals.
    • D. Asphalt is best crushed using toothed roll crusher.
    • Discuss
    • 6. Pick out the wrong statement pertaining to the roll crushers.

    • Options
    • A. Maximum feed size determines the required roll diameter.
    • B. For hard material's crushing, the reduction ratio should not exceed 4.
    • C. Both the rolls run necessarily at the same speed.
    • D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced.
    • Discuss
    • 7. The value of 'angle of nip' is generally about

    • Options
    • A. 16°
    • B. 32°
    • C. 52°
    • D. 64°
    • Discuss
    • 8. For sizing of fine materials, the most suitable equipment is a

    • Options
    • A. trommel
    • B. grizzly
    • C. shaking screen
    • D. vibrating screen
    • Discuss
    • 9. If a force greater than that of gravity is used to separate solids & fluids of different densities, the process is termed as the

    • Options
    • A. sedimentation
    • B. flocculation
    • C. dispersion
    • D. centrifugation
    • Discuss
    • 10. Pick out the wrong statement.

    • Options
    • A. Recycled coarse material to the grinder by a classifier is termed as circulating load.
    • B. Wear and tear in wet crushing is more than that in dry crushing of materials.
    • C. Size enlargement (opposite of size reduction) is not a mechanical operation.
    • D. A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas.
    • Discuss


    Comments

    There are no comments.

Enter a new Comment