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Mechanical Operations problems

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

  • Options
  • A. 3
  • B. 30
  • C. 85
  • D. 25
    • Discuss
  • 3. 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
  • 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. 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
  • 6. 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
  • 7. 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
  • 8. 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
  • 9. Maximum size reduction in a fluid energy mill is achieved by

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

  • Options
  • A. flocculation
  • B. sedimentation
  • C. filtration
  • D. none of these.
    • Discuss

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