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  • Question

  • Percentage of drum submerged in the slurry in case of rotary drum filter is


  • Options
  • A. 3
  • B. 30
  • C. 85
  • D. 25

  • Correct Answer
  • 30 

    • Mechanical Operations problems

    Search Results

    • 1. As particle size is reduced

    • Options
    • A. screening becomes progressively more difficult.
    • B. screening becomes progressively easier.
    • C. capacity and effectiveness of the screen is increased.
    • D. none of these.
      • Discuss
    • 2. The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.

    • Options
    • A. rate
    • B. pressure
    • C. both (a) & (b)
    • D. neither (a) nor (b)
      • Discuss
    • 3. What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?

    • Options
    • A. 0.5
    • B. 1.0
    • C. 2.76
    • D. 0.66
      • Discuss
    • 4. In a roll crusher, both the rolls

    • Options
    • A. have the same diameter.
    • B. are rotated towards each other.
    • C. run either at the same or different speeds.
    • D. all (a), (b) and (c).
      • Discuss
    • 5. Dry powdery solid materials are transported by a __________ conveyor.

    • Options
    • A. belt
    • B. bucket
    • C. screw
    • D. none of these
      • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. 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

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