Chemical Engineering MCQs

Page No. 495

An under-designed steam trap will___________________?


aWaste steam


bDestroy itself of acceleration wear due to rapid recycling


cBack up condensate and cause water hammer in steam line


dNone of these



Excessive liquid gradient on a tray may result in the______________________?


aMaldistribution of gas


bBack trapping


cGas blowing beneath cap skit


dAll A., B. and C.


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


b15


c7.5


d50


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


b5-8


c10-15


d20-25


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


b0.6 to 0.7


c0.85 to 0.95


d1.5 to 2


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


b15 to 30


c40 to 50


d55 to 75


View Answer 15 to 30

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


aHold baffle in space


bFix the tubes in position


cAccount for thermal strain


dNone of these


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


bLess


cSame


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


View Answer Less

Saddle supports are used for supporting _____________ vessels?


aHorizontal cylindrical


bTall vertical


cThick walled vertical


dThick spherical



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


aPlate spacing


bDepth of liquid above the bubble cap slots


cVapour velocity in the volume between the plates


dAll A., B. and C.


View Answer All A., B. and C.

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