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

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

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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

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dAll A, B. & C.

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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

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bGives a lower shell side pressure drop

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cCan pack more surface area into a shell of given diameter

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dNone of these

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Planck’s distribution law is valid for _____________ bodies?


aBlack

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bWhite

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cColoured

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dAll A., B. & C.

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View Answer Coloured

Steam trap is used to_________________?


aCondense the steam flowing in the pipeline

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bRemove water resulting from partial condensation of steam

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cStop the supply of steam

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dNone of these

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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)

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bOutlet temperature of both the hot and cold fluid are same

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

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dNone of these

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Vent pipes are provided in a condenser to ________________?


aRemove non-condensable gases

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bPurge the condenser

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cFacilitate easy cleaning of tubes

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dNone of these

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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

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bLower shell side pressure drop

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cHigher tube side heat transfer co-efficient

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dHigher shell side heat transfer co-efficient

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


aVon-Karman

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bReynolds

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cColburn

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dPrandtl

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View Answer Prandtl

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


aScaling

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bHighly viscous

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cCorrosive

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dSalty

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View Answer Highly viscous

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


aConduction

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bConvection

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cRadiation

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dBoth A. & C.

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View Answer Convection

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