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  • Question
  • Xanthates are used in the froth floatation process as a/an


  • Options
  • A. conditioner
  • B. frother
  • C. collector
  • D. activator

  • Correct Answer
  • collector 


  • Mechanical Operations problems


    Search Results


    • 1. The most efficient equipment for the removal of sub-micronic dust particles from blast furnace gas is the

    • Options
    • A. venturi atomiser
    • B. gravity settling chamber
    • C. electro-static precipitator
    • D. cyclone separator
    • Discuss
    • 2. Particle size range in which dust catcher (gravity settling chamber) works most effectively and efficiently is __________ microns.

    • Options
    • A. < 5
    • B. 10 to 25
    • C. < 74
    • D. > 1000
    • Discuss
    • 3. With increase in the pressure drop across the cake, the specific cake resistance for the compressible sludge

    • Options
    • A. increases
    • B. decreases
    • C. remains constant
    • D. increases linearly
    • Discuss
    • 4. Sphericity of raschig ring (whose length and diameter are equal) is

    • Options
    • A. >1
    • B. <1
    • C. 1
    • D. 2
    • Discuss
    • 5. Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

    • Options
    • A. Wet grinding in low viscous suspension.
    • B. Wet grinding in high viscous suspension.
    • C. Dry grinding of large particles (upto 1.25 cms).
    • D. Dry grindng of large particles in un-baffed mills.
    • Discuss
    • 6. A filter press is

    • Options
    • A. a batch filter.
    • B. not suitable, if the liquid is the main product.
    • C. having prohibitively high maintenance cost.
    • D. not suitable for wide range of materials under varying operating conditions of cake thickness and pressure.
    • Discuss
    • 7. The capacity of a gyratory crusher is __________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.

    • Options
    • A. same as
    • B. 2.5 times
    • C. 5 times
    • D. 10 times
    • Discuss
    • 8. Use of grinding aids results in the

    • Options
    • A. enhanced production rate.
    • B. finer products.
    • C. both (a) & (b).
    • D. neither (a) nor (b).
    • Discuss
    • 9. A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

    • Options
    • A. thickener
    • B. classifier
    • C. strainer
    • D. clarifier
    • Discuss
    • 10. The main differentiation factor between tube mill and ball mill is the

    • Options
    • A. length to diameter ratio.
    • B. size of the grinding media.
    • C. final product size.
    • D. operating speed.
    • Discuss


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