Chemical Engineering MCQs

Page No. 496

Which of the following is used to set the diameter of the distillation column ?


aNumber of theoretical plates


bStatic submergence


cAllowable vapour velocity


dLength of straight rectangular weir on cross-flow tray



The dust collection efficiency of electrostatic precipitator increases with increase in the_________________?


aGas flow rate


bElectrode area


cBoth A. & B.


dNeither A. nor B.


View Answer Electrode area

A cylindrical storage tank can have a self supported conical roof ?


aIf its diameter is less than 15-20 metres


bIf its diameter is more than 50 meters


cIf the thickness of the roof is more than that of the cylindrical shell


dIrrespective of its diameter



Spherical shaped pressure vessel is considered to be the most ideal, because it can___________________?


aWithstand higher pressure for a given metallic shell thickness


bBe fabricated very easily


cBe designed without wind load considerations


dBe supported very easily



Rotary driers are most economically designed for the number of heat transfer units (HTU) from _________________?


a0.01 to 1


b1.5 to 2.5


c5 to 10


d10 to 20


View Answer 1.5 to 2.5

Baffle width is normally taken as ______________ times the tank diameter?


a0.1-0.12


b0.4-0.5


c0.45-0.6


d0.2-0.45


View Answer 0.1-0.12

Vertical vessels are not supported by____________________?


aBrackets


bSkirts


cColumns


dSaddles


View Answer Saddles

The units of Young’s modulus of elasticity and ________________ are the same?


aStrain


bStress


cModular ratio


dNone of these


View Answer Stress

Pick out the wrong statement pertaining to the design of a long tube vertical evaporator ?


aTube dia is 3-6 cms, while tube length in 3-6 metres


bSteam is fed to the shell, whereas the liquor is filled inside the tube


cLiquor level is maintained at 1/3rd to 1/2 of the height of the tube


dNone of these


View Answer None of these

In case of a continuous distillation column, increase in reflux ratio may result in the______________?


aLower fixed charges for the column


bGreater cost for the reboiler heat supply


cGreater cost for the condenser coolant


dAll A., B. and C.


View Answer All A., B. and C.

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