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

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bPreferably flow outside the tube

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cFlow at a very slow velocity

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

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


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

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bDensity of the gas and inversely as viscosity of the gas

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cViscosity of the gas and inversely as density of the gas

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dNone of these

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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

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bAre less prone to fouling

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

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dNone of these

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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

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

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

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dAll A., B. & C.

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View Answer All A., B. & C.

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


aDecreases

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bIncreases

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cRemain unaffected

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

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View Answer Decreases

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


aExpansion joint

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bChanges in its direction

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cChange in the shape of pipeline

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dAll A., B. and C.

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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

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b1.25-1.50 times

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c2.5 times

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done-fourth of

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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

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bReduction of discontinuity in shape at the junction

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cMaking the joint leak proof

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dNone of these

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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

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bTo provide support to the tube bundle

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cTo reduce the induced vibration in the tubes

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

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


a0.1

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b0.8

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c0.25

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d0.5

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View Answer 0.8

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