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  • Question
  • In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the


  • Options
  • A. square root of the velocity.
  • B. square of the viscosity.
  • C. filtration time only.
  • D. washing time only.

  • Correct Answer
  • square root of the velocity. 


  • Mechanical Operations problems


    Search Results


    • 1. Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

    • Options
    • A. bronze
    • B. stainless steel
    • C. flint or porcelain
    • D. concrete
    • Discuss
    • 2. For a non-spherical particle, the sphericity

    • Options
    • A. is defined as the ratio of surface area of a sphere having the same volume as the particle to the actual surface area of the particle.
    • B. has the dimension of length.
    • C. is always less than 1.
    • D. is the ratio of volume of a sphere having the same surface area as the particle to the actual volume of the particle.
    • Discuss
    • 3. Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

    • Options
    • A. resins
    • B. gums
    • C. hard rubber
    • D. waxes
    • Discuss
    • 4. Which of the following is not an ultrafine grinder (colloid mill)?

    • Options
    • A. Micronizers
    • B. Agitated mills and fluid energy mills
    • C. Toothed roll crusher
    • D. Hammer mills with internal classification
    • Discuss
    • 5. __________ centrifuge is normally used in sugar mills.

    • Options
    • A. Tubular bowl
    • B. Disc-bowl
    • C. Suspended batch basket
    • D. Perforated horizontal basket continuous
    • Discuss
    • 6. Pick out the correct statement:

    • Options
    • A. Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
    • B. The operating cost of shaking screen is more than that of a vibrating screen.
    • C. Screen capacity does not depend upon the specific gravity of the minerals.
    • D. Asphalt is best crushed using toothed roll crusher.
    • Discuss
    • 7. Froth floatation is the most suitable for treating

    • Options
    • A. iron ores
    • B. sulphide ores
    • C. quartzite
    • D. none of these
    • Discuss
    • 8. Balls for ball mills are never made of

    • Options
    • A. forged/cast steel
    • B. lead
    • C. cast iron
    • D. alloy steel
    • Discuss
    • 9. Which of the following is not categorised as a "mechanical operation"?

    • Options
    • A. Agitation
    • B. Filtration
    • C. Size enlargement
    • D. Humidification
    • Discuss
    • 10. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is

    • Options
    • A. 4
    • B. 1/4
    • C. 1
    • D. 1/2
    • Discuss


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