Chemical Engineering MCQs

Page No. 673

Which of the following is not a batch drier ?


aTruck drier

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bAgitated pan drier

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cFluidised bed drier

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dVacuum shelf drier

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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

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b0.5

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c50

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d150

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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

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bMore than

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cEqual to

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dEither A. or B.; depends on the solid

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View Answer Less than

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


aDiffusivity of solute increases

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bViscosity of solvent decreases

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cThermal conductivity of solute increases

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dNone of these

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Leaching rate is independent of the________________?


aAgitation

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bTemperature

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cParticle size

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dNone of these

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View Answer None of these

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


aPlate

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bBaffle

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cPacked

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dNone of these

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View Answer Baffle

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


aIncreasing the air velocity over the wet surfaces

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bReducing the humidity of entering air

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cLowering the barometric pressure

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dNone of these

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View Answer None of these

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


aPartial pressure

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bMole ratio

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cMole fraction

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dNone of these

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View Answer Mole ratio

Dimension of mass diffusivity is the same as that of_____________________?


aKinematic viscosity

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bDynamic viscosity

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cSurface tension

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dPressure

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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

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bKc = Kp/RT = Km . RT/P

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cKc = Kp . RT = Km . RT/p

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dNone of these

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