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Home ‣ Chemical Engineering ‣ Fluid Mechanics See What Others Are Saying!
  • Question

  • Water hammer in a pipeline results from the


  • Options
  • A. bursting of pipelines due to closure by a valve.
  • B. rapid pressure change due to a rapid change in the rate of flow.
  • C. pressure increase due to closure of a valve resulting in decrease in rate of flow.
  • D. none of these.

  • Correct Answer
  • rapid pressure change due to a rapid change in the rate of flow. 

    • More questions

    • 1. Crushing efficiency is the ratio of the

    • Options
    • A. surface energy created by crushing to the energy absorbed by the solid.
    • B. energy absorbed by the solid to that fed to the machine.
    • C. energy fed to the machine to the surface energy created by crushing.
    • D. energy absorbed by the solid to the surface energy created by crushing.
      • Discuss
    • 2. Dearomatisation of kerosene (by liquid sulphur dioxide extraction) is done to

    • Options
    • A. increase its smoke point.
    • B. improve its oxidation stability.
    • C. decrease the breathing loss.
    • D. none of these.
      • Discuss
    • 3. The LMTD correction factor (FT) is applied in __________ heat exchangers.

    • Options
    • A. 1-1 cocurrent
    • B. double pipe
    • C. all multipass
    • D. all (involving liquid/liquid heat transfer)
      • Discuss
    • 4. Pick out the wrong statement.

    • Options
    • A. Linear polymers are formed from bifunctional groups only and are normally thermoplastic.
    • B. Cross-linked branched chain polymers are either elastometric or thermosetting.
    • C. Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point.
    • D. Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction.
      • Discuss
    • 5. In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 6. Mercury thermometer can be used to measure the temperature upto __________ °C.

    • Options
    • A. 100
    • B. 250
    • C. 350
    • D. 750
      • Discuss
    • 7. Triple superphosphate is made by reacting phosphate rock with __________ acid.

    • Options
    • A. phosphoric
    • B. nitric
    • C. sulphuric
    • D. hydrochloric
      • Discuss
    • 8. Hot face insulating linings of high purity alumina fused mullite are used, where

    • Options
    • A. very high temperatures are involved.
    • B. highly reducing conditions are involved.
    • C. presence of iron or silica is harmful.
    • D. all (a), (b) and (c).
      • Discuss
    • 9. The progressive warming up of the earth's surface is mainly due to the

    • Options
    • A. automobile exhaust.
    • B. blanketing effect of CO2 in the atmosphere.
    • C. de-forestation.
    • D. thickening of ozone layer.
      • Discuss
    • 10. Pick out the wrong statement

    • Options
    • A. In a flanged and standard dished head, the crown radius is ? shell outside diameter.
    • B. In a flanged and shallow dished head, the crown radius is > shell outside diameter.
    • C. Flat head covers are most suitable for larger vessels operating at very high pressure.
    • D. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses.
      • Discuss

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