Chemical Engineering MCQs

Page No. 668

If „f’ is defined as above, then which of the following applies to a feed at dew point ?


af = 1


bf 1


c< f


d< 1


View Answer f = 1

According to Chilton-Colburn analogy for mass transfer, NSt.NSc 2/3 is equal to_________________?


af


bf/2


c2f


d1/f


View Answer f/2

Wet bulb and dry bulb temperatures becomes identical at _______________ percent saturation curve?


a100


b50


c78


dNone of these


View Answer 100

The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an _________________ law?


aExponential


bParabolic


cLinear


dCubic


View Answer Exponential

Out of two equilibrium curves, first one lies above the diagonal and the second lies below the diagonal in the x-y plot. It means that separation by distillation is_________________?


aNot possible in the second case unless vacuum is applied


bNot possible in the second case unless high pressure is applied


cMore readily done in the second case compared to first one


dNone of these



A distillation column separates 10000 kg/hr of a benzene-toluene mixture as shown in the figure below: In the figure xF, xD and xW represent the weight fraction of benzene in the feed, distillate and residue respectively. The reflux ratio is_______________ ?


a0.5


b0.6


c1.0


d2.0


View Answer 0.6

_________________ is the separation technique used for desalination of sea water ?


aThermal diffusion


bReverse osmosis


cAdsorption


dAbsorption


View Answer Reverse osmosis

At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid _______________ that in dry packed tower ?


aIs greater than


bIs lower than


cIs same as


dCannot be predicted as data are insufficient


View Answer Is greater than

Free flowing granular materials can be best dried in a __________________ drier?


aRotary


bRotary


cDrum


dFreeze


View Answer Rotary

During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the _________________ remains constant ?


aWet bulb temperature


bPartial pressure of water vapor


cRelative humidity


dNone of these


View Answer Wet bulb temperature

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