Chemical Engineering MCQs

Page No. 443

Which is the most suitable for the concentration of foamy & frothy liquors ?


aAgitated film evaporator


bLong tube vertical evaporator


cOpen pan evaporator


dNone of these



The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m2. The approximate surface temperature (K) is (Stefan-Boltzmann constant = 5.67 × 10-8 W/m2.K4) ?


a1000


b727


c800


d1200


View Answer 1000

Boiling point elevation of an ideal solution_______________?


aIncreases rapidly with temperature rise


bDecreases rapidly with temperature rise


cIn independent of pressure


dBoth B. and C.



The main function of baffles provided in a shell and tube heat exchanger is to______________?


aFacilitate the cleaning of outer tube surface


bEnhance turbulence


cHold the tubes in position


dAll A , B & C


View Answer Enhance turbulence

Steam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?


a10-50


b100-500


c1000-1500


d5000-15000


View Answer 1000-1500

The ratio of total radiating power to the absorptivity of the body depends upon the _____________ as per Kirchoff‟s law?


aWavelength of radiation


bNature of the body


cTemperature of the body


dNone of these



For small temperature difference, the heat transfer rate as per Newton’s law of cooling is proportional to (where, Δt = excess temperature) ?


aΔt


bΔt2


cΔt3


d√(Δt)


View Answer Δt

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?


a50 -100 Kcal/hr.m2.°C


b50 -100 W/m2.°K


c50 -100 BTU/hr. ft.2°F


d1000 – 1500 BTU/hr. ft.2°F



Intermittent tube cleaning is possible to be done in case of a _____________ evaporator?


aBasket type


bHorizontal tube


cCalandria


dNone of these


View Answer Basket type

In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient______________?


aIncreases


bDecreases


cIs not affected


dMay increase or decrease; depends on the feed


View Answer Decreases

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