logo

CuriousTab

CuriousTab

Discussion

Home ‣ Chemical Engineering ‣ Mechanical Operations Comments
  • Question

  • Ultracentrifuges running at speeds upto 100000 rpm is normally used for the


  • Options
  • A. separation of isotopes based on their density or molecular weights difference.
  • B. concentration of rubber latex.
  • C. separation of cream from milk.
  • D. dewaxing of lubricating oil.

  • Correct Answer
  • separation of isotopes based on their density or molecular weights difference. 

    • Mechanical Operations problems

    Search Results

    • 1. During size reduction by a jaw crusher, the energy consumed decreases with the

    • Options
    • A. decreasing size of product at constant size of feed.
    • B. decreasing machine capacity.
    • C. increasing size of feed at constant reduction ratio.
    • D. none of these.
      • Discuss
    • 2. __________ is used for producing a thick suspension from a thin slurry.

    • Options
    • A. Cartridge filter
    • B. Rotary drum vacuum filter
    • C. Pressure filter thickener
    • D. Plate and frame filter press
      • Discuss
    • 3. Cake resistance is

    • Options
    • A. important in the beginning of filtration.
    • B. decreased with the time of filtration.
    • C. independent of pressure drop.
    • D. none of these.
      • Discuss
    • 4. Vibrating screens have capacity in the range of __________ tons/ft2 .mm mesh size.

    • Options
    • A. 0.2 to 0.8
    • B. 5 to 25
    • C. 50 to 100
    • D. 100 to 250
      • Discuss
    • 5. __________ mean diameter of particles is given by

    • Options
    • A. Mass
    • B. volume
    • C. Arithmetic
    • D. Volume surface
      • Discuss
    • 6. The energy consumed by a ball mill depends on

    • Options
    • A. its speed.
    • B. its ball load.
    • C. the density of the material being ground.
    • D. all (a), (b) and (c).
      • Discuss
    • 7. The unit of filter medium resistance is

    • Options
    • A. cm-1
    • B. gm/cm-1
    • C. cm/gm-1
    • D. gm-1
      • Discuss
    • 8. Wet seiving is employed, when the product contains __________ materials.

    • Options
    • A. abrasive
    • B. large quantity of very fine
    • C. coarse
    • D. non-sticky
      • Discuss
    • 9. The filter medium resistance is controlled by

    • Options
    • A. pressure drop alone
    • B. flow rate alone
    • C. both pressure drop and flow rate
    • D. cake thickness
      • Discuss
    • 10. A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

    • Options
    • A. 0.50
    • B. 0.58
    • C. 0.68
    • D. 0.62
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.