Chemical Engineering MCQs

Page No. 508

Stage efficiency for packed tower varies with the____________________?


aType & size of packing


bFluid rates and fluid properties


cOperating pressure and column diameter


dAll A., B. and C.


View Answer All A., B. and C.

Power required for agitation depends upon the______________________?


aHeight & properties of the liquid


bAgitator type & speed of agitation


cSize of agitator & the tank


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following is the best tube material from thermal conductivity point of view alone ?


aAluminium


bStainless steel


cCopper


dCarbon steel


View Answer Copper

The LMTD correction factor (FT) is defined as the __________________?


aRatio of true temperature difference to the LMTD


bRatio of LMTD to the true temperature difference


cDifferenced of true temperature difference and the LMTD


dGeometric mean of the true temperature difference and the LMTD



Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?


a6% of I.D.


b3 times the thickness


cEither A. or B., whichever is larger


dEither A. or B., whichever is smaller



In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ _____________ cms?


a1.2


b0.5


c3.8


d6.8


View Answer 3.8

Pick out the wrong statement pertaining to shell and tube heat exchanger_______________?


aClearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle


bBaffles are supported independently of the tubes by tie rods and positioned by spacers


cTie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter


dBracket supports are used for horizontal shell, while saddle support is used for vertical shell



In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the_______________?


aLiquid gradient on the tray


bLower skirt clearance


cLower static submergence


dSmall downcomer liquid seal



The minimum baffle height should be ______________?


aEqual to the impeller diameter


bTwice the impeller diameter


cTwice the tank diameter


d3/4 of the tank height



Pick out the wrong statement?


aIf sufficient residence time (around 8 seconds) is not provided to the downcoming liquid in the downcomer, it may entrain some vapour


bThe liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding


cThe discharge end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps


dNone of these


View Answer None of these

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