Chemical Engineering MCQs

Page No. 448

Heat exchangers operating, when the asymptotic range is reached, ?


aProvide very large heat transfer co-efficient


bResults in making part of the heating surface inactive


cResults in abruptly increased velocity


dNone of these



In counter flow compared to parallel flow, ?


aLMTD is greater


bLess surface area is required for a given heat transfer rate


cBoth A. and B.


dMore surface area is required for a given heat transfer rate


View Answer Both A. and B.

Mode of heat transfer involved in the cooling of air cooled internal combustion engine is_________________?


aConduction


bNatural convection


cForced convection


dNone of these


View Answer Natural convection

In a single effect evaporator, the economy is________________?


a1


b< 1


c> 1


dNone of these


View Answer < 1

Small scale evaporation is done in a_________________?


aHeat exchanger


bCondenser


cMultiple effect evaporator


dSteam jacketed kettle


View Answer Steam jacketed kettle

In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always__________________?


a< 1


b> 1


c1


d


View Answer < 1

Low thermal conductivity of heat insulating materials is due to its_________________?


aDense structure


bHigh proportion of air space


cHigh specific heat


dNone of these



In case of a vertical tube evaporator, with increase in the liquor level, the___________________?


aCapacity of the evaporator is decreased


bCapacity of the evaporator is increased


cTrue temperature drop increases


dBoth B. and C.



The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the___________________?


aHeating volume


bHeat transfer area


cNusselt number


dNone of these


View Answer Heat transfer area

Thermal diffusivity is given by__________________?


ak/ρCp


bρCp/k


cμCp/a


dμ/hCp


View Answer k/ρCp

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