Chemical Engineering MCQs

Page No. 495

An under-designed steam trap will___________________?


aWaste steam

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bDestroy itself of acceleration wear due to rapid recycling

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cBack up condensate and cause water hammer in steam line

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dNone of these

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Excessive liquid gradient on a tray may result in the______________________?


aMaldistribution of gas

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bBack trapping

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cGas blowing beneath cap skit

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dAll A., B. and C.

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View Answer All A., B. and C.

The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is ________________ cms?


a5

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b15

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c7.5

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d50

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View Answer 15

In packed towers provided with saddle packing, liquid redistributors are positioned at every _______________ times column diameter or 6 metres whichever is less?


a2-3

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b5-8

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c10-15

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d20-25

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View Answer 5-8

Vapor velocity in a distillation column for non-foaming mixture is in the range of ______________ times the flooding velocity?


a0.1 to 0.3

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b0.6 to 0.7

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c0.85 to 0.95

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d1.5 to 2

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View Answer 0.6 to 0.7

The diameter of a propeller agitator used in agitation tank ranges from ____________ percent of the tank diameter and its peripheral speed is normally 300 to 500 metres/minute ?


a5 to 10

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b15 to 30

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c40 to 50

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d55 to 75

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View Answer 15 to 30

In shell and tube heat exchangers, straight tie rods are used to_________________?


aHold baffle in space

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bFix the tubes in position

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cAccount for thermal strain

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dNone of these

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View Answer Hold baffle in space

Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is____________?


aMore

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bLess

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cSame

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dMore or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein

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View Answer Less

Saddle supports are used for supporting _____________ vessels?


aHorizontal cylindrical

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bTall vertical

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cThick walled vertical

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dThick spherical

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Which of the following factors determine the amount of entrainment in a distillation column ?


aPlate spacing

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bDepth of liquid above the bubble cap slots

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cVapour velocity in the volume between the plates

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dAll A., B. and C.

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View Answer All A., B. and C.

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