Chemical Engineering MCQs

Page No. 509

For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for dia of the tank in question), the thickness of the courses of shell_________________?


aDecreases upwards


bIncreases upwards


cRemains same throughout


dMay decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell


View Answer Decreases upwards

___________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids?


aSieve plate


bPacked


cBubble cap plate


dNone of these


View Answer Packed

What is the slope of the feed line, if the feed to a distillation column is a saturated liquid ?


a0


b


c> 1


d< 1


View Answer

High pressure fluid in a shell and tube heat exchanger should preferably be routed through the________________?


aTubes to avoid the expansion of high pressure shell construction


bShell side for smaller total pressure drop


cShell side, if the flow is counter-current and tube side if the flow is co-current


dShell side for large overall heat transfer co-efficient



______________ closure is the weakest enclosure for cylindrical vessels?


aHemispherical


bTorispherical


cConical or flat plate


dElliptical


View Answer Conical or flat plate

In a distillation column, bubble caps are located on trays with a pitch of ______________ times the outside diameter of the caps?


a1.3 to 2


b1.6 to 2


c2.51.5 to 3


d1.5 to 3


View Answer 1.3 to 2

Pick out the wrong statement pertaining to the design of a horizontal tube evaporator ?


aIt is unsuitable for concentrating those liquids, which form a scale or deposit salt


bIt is suitable for process, in which the final product is a liquor instead of solid


cIts usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres


dLiquor flows inside the tube, while the steam is outside submerging the tube



Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about ______________ percent of the total thickness?


a1 to 5


b10 to 20


c30 to 40


d40 to 50


View Answer 10 to 20

What is the value of ‘q’ for saturated vapor feed to a distillation column? (where q = fraction of the feed stream that is liquid ?


a0


b2


c1


d3


View Answer 0

Waxy crudes are treated with chemical additives mainly to_________________________?


aDepress its pour point


bDissolve wax


cPrecipitate wax


dRemove wax



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