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  • Question

  • 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

  • Correct Answer
  • 15 - 20 

    • Mechanical Operations problems

    Search Results

    • 1. 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
    • 2. rpm of a trommel at critical speed is given by (where, D = Diameter of trommel in ft)

    • Options
    • A.
    • B.
    • C.
    • D. 76.75 D
      • Discuss
    • 3. For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?

    • Options
    • A. Kozney-Karman equation
    • B. Leva's equation
    • C. Blake-Plummer equation
    • D. none of these
      • Discuss
    • 4. Which of the following is a continuous filter?

    • Options
    • A. Plate and frame filter
    • B. Cartridge filter
    • C. Shell and leaf filter
    • D. None of these
      • Discuss
    • 5. Critical speed of rotation, N (in rps - rotation per second) of a trammel is equal to (where, g = acceleration due to gravity = 9.81 m/sec2 and, r = radius of trammel, metre. )

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. Maximum size reduction in a fluid energy mill is achieved by

    • Options
    • A. compression
    • B. interparticle attrition
    • C. cutting
    • D. impact
      • Discuss
    • 7. The process opposite to 'dispersion' is termed as the

    • Options
    • A. flocculation
    • B. sedimentation
    • C. filtration
    • D. none of these.
      • Discuss
    • 8. Which of the following minerals is not subjected to magnetic separation method?

    • Options
    • A. Rutile
    • B. Galena
    • C. Chromite
    • D. Siderite
      • Discuss
    • 9. Wheat is ground into flour in a

    • Options
    • A. hammer crusher
    • B. roller crusher
    • C. impact mill
    • D. fluid energy mill
      • Discuss
    • 10. To produce talcum powder, use

    • Options
    • A. ball mill
    • B. hammer mill
    • C. jet mill
    • D. pin mill
      • Discuss

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