Chemical Engineering MCQs

Page No. 657

Agitator is provided in a crystalliser for____________________?


aAvoiding deposition on cooler surfaces


bFormation of nuclei


cCrystal growth


dAll A., B. and C.


View Answer All A., B. and C.

Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of__________________?


aMass diffusivity to momentum diffusivity


bThermal diffusivity to mass diffusivity


cMomentum diffusivity to thermal diffusivity


dNone of these



Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the ________________ number?


aSherwood


bSchmidt


cPeclet


dStanton


View Answer Sherwood

Cox chart is useful in the design of___________________?


aDistillation column


bEvaporator


cDryer


dCrystalliser


View Answer Distillation column

The binary diffusivity in gases and liquids vary respectively as_________________?


aT3/2 and T


bT and T3/2


c√T and T3/2


dT3/2 and √T


View Answer T3/2 and T

Decoction refers to the use of solvent________________?


aAt ambient temperature


bAt its boiling point


cIn its vapor form


dNone of these


View Answer At its boiling point

Ordinary diffusion process is also called ______________ diffusion?


aPressure


bThermal


cConcentration


dForced


View Answer Concentration

Out of the following gas-liquid contacting devices, for a given set of operating conditions, gas pressure drop is the least in ______________ tower?


aWetted wall


bBubble cap


cPerforated tray


dPacked


View Answer Wetted wall

The solvent used in liquid-liquid extraction should have _______________ less than one?


aSelectivity


bDistribution co-efficient


cBoth A. and B.


dNeither A. nor B.


View Answer Neither A. nor B.

Which of the following equipments is not used for liquid dispersion ?


aWetted wall towers


bPacked towers


cVenturi scrubbers


dAgitated vessels


View Answer Agitated vessels

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