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  • Question
  • Wheat is ground into flour in a


  • Options
  • A. hammer crusher
  • B. roller crusher
  • C. impact mill
  • D. fluid energy mill

  • Correct Answer
  • roller crusher 


  • Mechanical Operations problems


    Search Results


    • 1. Which of the following minerals is not subjected to magnetic separation method?

    • Options
    • A. Rutile
    • B. Galena
    • C. Chromite
    • D. Siderite
    • Discuss
    • 2. The process opposite to 'dispersion' is termed as the

    • Options
    • A. flocculation
    • B. sedimentation
    • C. filtration
    • D. none of these.
    • Discuss
    • 3. Maximum size reduction in a fluid energy mill is achieved by

    • Options
    • A. compression
    • B. interparticle attrition
    • C. cutting
    • D. impact
    • Discuss
    • 4. Trommels are revolving screens which normally operate in the range of __________ rpm.

    • Options
    • A. 1 - 2
    • B. 15 - 20
    • C. 40 - 50
    • D. 60 - 75
    • Discuss
    • 5. A screen is said to be blinded, when the

    • Options
    • A. oversizes are present in undersize fraction.
    • B. undersizes are retained in oversize fraction.
    • C. screen is plugged with solid particles.
    • D. screen capacity is abruptly increased.
    • Discuss
    • 6. To produce talcum powder, use

    • Options
    • A. ball mill
    • B. hammer mill
    • C. jet mill
    • D. pin mill
    • Discuss
    • 7. Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called

    • Options
    • A. classification
    • B. froth floatation
    • C. thickening
    • D. clarification
    • Discuss
    • 8. In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing.

    • Options
    • A. primary
    • B. secondary
    • C. fine
    • D. ultrafine
    • Discuss
    • 9. Filtration should be stopped in a filter press, if the

    • Options
    • A. cake becomes very dense.
    • B. liquor stops flowing out to the discharge.
    • C. filtration pressure rises suddenly.
    • D. both(b)&(c).
    • Discuss
    • 10. A gravity decanter is meant for the separation of two __________ density.

    • Options
    • A. immiscible liquids of different
    • B. miscible liquids of different
    • C. immiscible liquids of same
    • D. miscible liquids of same
    • Discuss


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