Chemical Engineering MCQs

Page No. 659

If Rm is the minimum reflux ratio, the optimum reflux ratio may be around _________________ Rm ?


a1.2 to 1.5


b2.5 to 3


c3 to 4


d5


View Answer 1.2 to 1.5

_______________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower?


aSherwood


bStanton


cLewis


dLewis


View Answer Lewis

Gaseous diffusivity at atmospheric pressure is of the order of _____________________ cm2/second?


a1


b1 to 5


c5 to 10


d> 10


View Answer 1

Drift in a cooling tower is ___________________?


aThe water entrained by the circulating air


bDependent on the water lost by evaporation


cDesirable


dAll A., B. & C.



HETP is numerically equal to HTU, only when the operating line ______________________?


aLies below the equilibrium line


bLies above the equilibrium line


cAnd equilibrium lines are parallel


dIs far from the equilibrium line



At a given equilibrium pressure, with increase in temperature, the concentration of adsorbed gas on solid adsorbent __________________?


aIncreases


bDecreases


cRemains unchanged


dIncreases exponentially


View Answer Decreases

Equilibrium moisture of a solid is equal to the total moisture minus free moisture. Which of the following substances will have maxi-mum equilibrium moisture ?


aAnthracite coal


bRag paper


cBamboo


dInorganic solids


View Answer Bamboo

Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and _________________?


aHumidified with wet bulb temperature decreasing


bHumidified at constant wet bulb temperature


cDehumidified


dNone of these



Components, having widely different boiling point in a binary mixture, can be separated using ________________ distillation?


aMolecular


bExtractive


cSteam


dSimple


View Answer Simple

Humid volume is the total volume in m3 of 1 kg of _____________________?


aVapour laden gas at 1 atm. and room temperature


bGas plus its accompanying vapour at 1 atm. and room temperature


cGas plus its accompanying vapour at 1 atm. and gas temperature


dVapour laden gas at 1 atm. and gas temperature



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