Chemical Engineering MCQs

Page No. 466

In a gas-liquid shell and tube heat exchanger, the_________________?


aPresence of a non-condensable gas decreases the condensing film co-efficient


bGases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature


cGases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes


dAll A, B. & C.


View Answer All A, B. & C.

In a shell and tube heat exchanger, square pitch compared to triangular pitch__________________?


aGives a higher shell side pressure drop


bGives a lower shell side pressure drop


cCan pack more surface area into a shell of given diameter


dNone of these



Planck’s distribution law is valid for _____________ bodies?


aBlack


bWhite


cColoured


dAll A., B. & C.


View Answer Coloured

Steam trap is used to_________________?


aCondense the steam flowing in the pipeline


bRemove water resulting from partial condensation of steam


cStop the supply of steam


dNone of these



LMTD for counter-flow and parallel flow heat exchanger will be the same, when the_________________?


aCold fluid is heated to a certain temperature by condensing steam (isothermal fluid)


bOutlet temperature of both the hot and cold fluid are same


cOutlet temperature of hot fluid is less than the outlet temperature of the cold fluid


dNone of these



Vent pipes are provided in a condenser to ________________?


aRemove non-condensable gases


bPurge the condenser


cFacilitate easy cleaning of tubes


dNone of these



The advantage of using a 1 – 2 shell and tube heat exchanger over a 1 – 1 shell and tube heat exchanger is_________________?


aLower tube side pressure drop


bLower shell side pressure drop


cHigher tube side heat transfer co-efficient


dHigher shell side heat transfer co-efficient



The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?


aVon-Karman


bReynolds


cColburn


dPrandtl


View Answer Prandtl

Open pan evaporators are preferred to be used, when the solution to be concentrated is_________________?


aScaling


bHighly viscous


cCorrosive


dSalty


View Answer Highly viscous

When warm and cold liquids are mixed, the heat transfer is mainly by_______________?


aConduction


bConvection


cRadiation


dBoth A. & C.


View Answer Convection

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