Chemical Engineering MCQs

Page No. 673

Which of the following is not a batch drier ?


aTruck drier


bAgitated pan drier


cFluidised bed drier


dVacuum shelf drier


View Answer Fluidised bed drier

The reflux to a distillation column is 100 moles/hr, when the overhead product rate is 50 moles/hr. The reflux ratio is____________________?


a2


b0.5


c50


d150


View Answer 2

Bound moisture is that liquid which exerts an equilibrium vapor pressure ________________ that of the pure liquid at the given temperature ?


aLess than


bMore than


cEqual to


dEither A. or B.; depends on the solid


View Answer Less than

With increase in temperature, the rate of leaching increases, because the___________________?


aDiffusivity of solute increases


bViscosity of solvent decreases


cThermal conductivity of solute increases


dNone of these



Leaching rate is independent of the________________?


aAgitation


bTemperature


cParticle size


dNone of these


View Answer None of these

Sodium bicarbonate is produced during soda ash manufacture using a _______________ tower?


aPlate


bBaffle


cPacked


dNone of these


View Answer Baffle

The cooling effect in a cooling tower cannot be increased by_____________________?


aIncreasing the air velocity over the wet surfaces


bReducing the humidity of entering air


cLowering the barometric pressure


dNone of these


View Answer None of these

For a single component absorber, the operating line is straight only when plotted in term of ______________ units?


aPartial pressure


bMole ratio


cMole fraction


dNone of these


View Answer Mole ratio

Dimension of mass diffusivity is the same as that of_____________________?


aKinematic viscosity


bDynamic viscosity


cSurface tension


dPressure


View Answer Kinematic viscosity

The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?


aKc = Kp = Km


bKc = Kp/RT = Km . RT/P


cKc = Kp . RT = Km . RT/p


dNone of these



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