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Home Chemical Engineering Fluid Mechanics See What Others Are Saying!
  • Question
  • The terminal velocity of a small sphere settling in a viscous fluid varies as the


  • Options
  • A. first power of its dimeter.
  • B. inverse of the fluid viscosity.
  • C. inverse square of the diameter.
  • D. square of the difference in specific weights of solid & fluid.

  • Correct Answer
  • inverse of the fluid viscosity. 


  • More questions

    • 1. Instrumentation in a plant offers the advantage of

    • Options
    • A. greater safety of operation
    • B. better quality of product
    • C. greater operation economy
    • D. all (a), (b) and (c)
    • Discuss
    • 2. Pick out the wrong statement.

    • Options
    • A. Heat capacity of a diatomic gas is higher than that of a monoatomic gas.
    • B. Equal volumes of Argon and Krypton contain equal number of atoms.
    • C. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023.
    • D. The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture
    • Discuss
    • 3. Melamine formaldehyde resin which has a very high anti tacking properties, is not used for the

    • Options
    • A. electrical insulation purpose.
    • B. tanning of leather.
    • C. strengthening of plaster of paris.
    • D. decorative laminates.
    • Discuss
    • 4. Rittinger's crushing law states that

    • Options
    • A. work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product.
    • B. work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product.
    • C. work required in crushing is proportional to the new surface created.
    • D. for a given machine and feed, crushing efficiency is dependent on the size of the feed & product.
    • Discuss
    • 5. Magnesite refractories have low resistance to

    • Options
    • A. attack by basic slag.
    • B. abrasion.
    • C. disintegration on sudden change of temperature.
    • D. both (b) and (c).
    • Discuss
    • 6. Pick out the wrong statement.

    • Options
    • A. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding of metals.
    • B. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn, is called its flash point.
    • C. Each ton of petroleum oil on distillation produces about 30-50 Nm3 of gas.
    • D. Maximum yield of naphthalene is obtained on distillation of crude oil.
    • Discuss
    • 7. In chemical process equipments, the conical bottom heads used, usually has an apex angle of

    • Options
    • A. 20°
    • B. 40°
    • C. 60°
    • D. 80°
    • Discuss
    • 8. Operating condition in the electrical dehydrators for crude oil is about

    • Options
    • A. 6.5 kgf/Cm2 & 95°C.
    • B. 1 atm. & 110 °C.
    • C. 20 kgf/cm2 & 110°C.
    • D. 50 atm. and 150°C.
    • Discuss
    • 9. Radioactive decay follows __________ order kinetics.

    • Options
    • A. first
    • B. second
    • C. third
    • D. zero.
    • Discuss
    • 10. 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


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