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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