Chemical Engineering MCQs

Page No. 439

Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ?


aBleed point


bVent


cCatchall


dBaffle


View Answer Catchall

The equivalent diameter for pressure drop is ________________ that for heat transfer?


aSmaller than


bGreater than


cEqual to


dNot related with


View Answer Smaller than

As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?


aContinues to increase


bContinues to decrease


cGoes through a minimum


dGoes through a maximum



Fouling factor_____________________?


aIs a dimensionless quantity


bDoes not provide a safety factor for design


cAccounts for additional resistances to heat flow


dNone of these



If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid_________________?


aRemains unchanged


bIncreases


cIncreases or decreases depending on number of shell passes


dDecreases


View Answer Decreases

The unit of heat transfer co-efficient in SI unit is____________________?


aJ/M2°K


bW/m2°K


cW/m°K


dJ/m°K


View Answer W/m2°K

Which type of heat exchanger is preferred for heavy heat loads ?


aDouble pipe


bPlate fine


cSeries and parallel set of shell and tube


dNone of these



With increase in porosity, the thermal conductivity of a solid substance__________________?


aIncreases


bDecreases


cRemains unchanged


dMay increase or decrease; depends on the solid


View Answer Decreases

Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?


aGet economical temperature difference by using moderate pressure steam


bFacilitate forward feeding in multiple effect evaporation


cConcentrate heat sensitive materials


dAchieve very high concentration of the final product



The number of kg vaporised per kg of steam fed to the evaporator is defined as____________?


aCapacity


bRate of evaporation


cEconomy


dRate of vaporisation


View Answer Economy

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