Chemical Engineering MCQs

Page No. 494

For a given design of bubble cap, the number of bubble caps to be used per tray is set by the _________________?


aAllowable gas velocity through the slots

✓


bPlate spacing

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cDiameter of the column

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dAll A., B. and C.

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The practical representative values of HETP for a number of commercial operations lies within a range of ______________ metre?


a0.1-0.2

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b0.2-0.5

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c0.4-0.9

✓


d1.2-1.5

✖


View Answer 0.4-0.9

The minimum tray spacing in distillation column of diameter less than 3 ft is normally _____________ inches?


a6

✓


b18

✖


c24

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d34

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View Answer 6

For a cylindrical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness ?


aHemispherical

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bEllipsoidal (2 : 1)

✓


cConical

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dFlat plate

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View Answer Ellipsoidal (2 : 1)

In a distillation column, minimum clearance to be maintained between the overflow weir and the last row of the bubble caps is ______________ cms?


a2.5

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b7.5

✓


c15

✖


d15

✖


View Answer 7.5

Joint efficiency (J) for a seamless pipe is_______________?


a1

✓


b0.85

✖


c1.5

✖


d< 0.5

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View Answer 1

In condenser, the cooling water is passed in the tube side in a pass arrangement, because________________?


aIt reduces heat transfer area

✓


bMore thinner tubes can be used

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cPressure drop is reduced

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dIt makes condenser compact

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Maximum allowable vapour velocity in a bubble cap tower is determined by the ____________________?


aEntrainment considerations

✓


bVapour density

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cDiameter of the column

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dNone of these

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Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around_______________?


a0.4-0.6

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b0.35-0.75

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c0.1-0.2

✓


d0.55-0.85

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View Answer 0.1-0.2

Baffles may be eliminated for_________________?


aLow viscosity liquids (< 200 poise)

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bHigh viscosity liquids (> 600 poise)

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cLarge diameter tanks

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dNone of these

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