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  • Question
  • To remove dirt from the flowing fluid, we use a


  • Options
  • A. coagulant
  • B. gravity settler
  • C. strains
  • D. clarifier

  • Correct Answer
  • strains 


  • Mechanical Operations problems


    Search Results


    • 1. With increase in the capacity of screens, the screen effectiveness

    • Options
    • A. remains unchanged
    • B. increases
    • C. decreases
    • D. decreases exponentially
    • Discuss
    • 2. In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

    • Options
    • A. primary
    • B. secondary
    • C. fine
    • D. ultrafine
    • Discuss
    • 3. Screen capacity is expressed in terms of

    • Options
    • A. tons/hr
    • B. tons/ft2
    • C. both (a) & (b)
    • D. tons/hr-ft2
    • Discuss
    • 4. __________ conveyors are also called scrapers.

    • Options
    • A. Apron
    • B. Screw
    • C. Helical flight
    • D. both (b) & (c)
    • Discuss
    • 5. Which one is a filter aid?

    • Options
    • A. Convas fabric
    • B. Diatomaceous earth
    • C. Calcined lime
    • D. None of these
    • Discuss
    • 6. Which of the following comes in the category of primary crusher for hard and tough stone?

    • Options
    • A. Jaw crusher
    • B. Cone crusher
    • C. Gyratory crusher
    • D. None of these
    • Discuss
    • 7. A fluid energy mill is used for

    • Options
    • A. cutting
    • B. grinding
    • C. ultra grinding
    • D. crushing
    • Discuss
    • 8. Which of the following is the softest material?

    • Options
    • A. Talc
    • B. Feldspar
    • C. Corundum
    • D. Calcite
    • Discuss
    • 9. Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance ? = viscosity of the filtrate)

    • Options
    • A. S
    • B. 1/R
    • C. 1/?
    • D. all (a), (b) & (c)
    • Discuss
    • 10. Optimum ratio of operating speed to critical speed of a trommel is

    • Options
    • A. 0.33-0.45
    • B. 1.33-1.45
    • C. 0.5-2
    • D. 1.5-2.5
    • Discuss


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