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  • Question
  • Pick out the correct statement.


  • Options
  • A. The capacity and the effectiveness of a screen are the same.
  • B. The capacity and the effectiveness of screen are opposing factors.
  • C. The screening surface of a 'reel' (a revolving screen used in flour mills) is made of silk bolting cloth supported by wire mesh.
  • D. both (b) and (c).

  • Correct Answer
  • both (b) and (c). 


  • Mechanical Operations problems


    Search Results


    • 1. The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

    • Options
    • A. 3 to 4
    • B. 8 to 10
    • C. 10 to 15
    • D. 15 to 20
    • Discuss
    • 2. Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called

    • Options
    • A. classification
    • B. sedimentation
    • C. clarification
    • D. decantation
    • Discuss
    • 3. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a __________ surface.

    • Options
    • A. plane
    • B. curved
    • C. ribbed
    • D. either (a) or (b)
    • Discuss
    • 4. The main differentiation factor between tube mill and ball mill is the

    • Options
    • A. length to diameter ratio.
    • B. size of the grinding media.
    • C. final product size.
    • D. operating speed.
    • Discuss
    • 5. A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

    • Options
    • A. thickener
    • B. classifier
    • C. strainer
    • D. clarifier
    • Discuss
    • 6. In classification, particles are said to be equal settling, if they have the same terminal velocities in the

    • Options
    • A. different fluids
    • B. same fluid
    • C. same field of force
    • D. both (b) and (c)
    • Discuss
    • 7. Solvent deoiling process is used for separating oil and soft wax from hard wax. Methyl iso-butyl ketone and methyl ethyl ketone (MEK) are two commonly used deoiling solvents. Use of former as the deoiling solvent has the advantages of the

    • Options
    • A. elimination of solvent drying facility.
    • B. higher nitration temperature.
    • C. lower solvent dilution ratio.
    • D. all (a), (b) & (c).
    • Discuss
    • 8. Feedstock for the production of biodiesel is

    • Options
    • A. herbal plants
    • B. used vegetable oils
    • C. LSHS
    • D. bagasse
    • Discuss
    • 9. Flash point of an oil is determined by the

    • Options
    • A. Pensky Martens apparatus.
    • B. Ramsbottom apparatus.
    • C. Saybolt viscometer.
    • D. Conradson apparatus.
    • Discuss
    • 10. Naphthenic acid is a/an __________ compound.

    • Options
    • A. sulphur
    • B. nitrogen
    • C. oxygen
    • D. none of these
    • Discuss


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