Chemical Engineering MCQs

Page No. 479

When one of the fluids is highly corrosive and has fouling tendency, it should_____________________?


aPreferably flow inside the tube for its easier internal cleaning


bPreferably flow outside the tube


cFlow at a very slow velocity


dFlow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current



In a bag filter, the pressure drop increases directly as the___________________?


aDensity of the gas, but is independent of the viscosity of the gas


bDensity of the gas and inversely as viscosity of the gas


cViscosity of the gas and inversely as density of the gas


dNone of these



In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?


aAre easier to clean


bAre less prone to fouling


cCan be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less


dNone of these



In a vertical short tube evaporator (Calandria type), the ______________________?


aTube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylindrical drum dia of 1-6 metres are normally used


bArea of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube


cLiquor is inside the tube while the steam is outside the tube


dAll A., B. & C.


View Answer All A., B. & C.

For a given fluid, as the pipe diameter increases, the pumping cost ____________________?


aDecreases


bIncreases


cRemain unaffected


dMay increase or decrease depending upon whether the fluid is Newtonian or non-Newtonian


View Answer Decreases

Movement of pipeline caused by thermal expansion is taken care by providing ___________________?


aExpansion joint


bChanges in its direction


cChange in the shape of pipeline


dAll A., B. and C.


View Answer All A., B. and C.

In most of the shell and tube heat exchangers, the tube pitch is generally ______________ the tube diameter?


aLess than


b1.25-1.50 times


c2.5 times


done-fourth of


View Answer 1.25-1.50 times

Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of ____________________?


aPreventing the local overstressing of the shell around the opening


bReduction of discontinuity in shape at the junction


cMaking the joint leak proof


dNone of these



The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles ?


aTo increase the residence time of shell side fluid


bTo provide support to the tube bundle


cTo reduce the induced vibration in the tubes


dTo increase the tube side heat transfer co-efficient by inducing turbulence



In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as___________________?


a0.1


b0.8


c0.25


d0.5


View Answer 0.8

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