Chemical Engineering MCQs

Page No. 648

1 kg of a saturated aqueous solution of a highly soluble component A at 60°C is cooled to 25°C. The solubility limits of A are (0.6 kgA/kg water) at 60°C and (0.2 kgA/kg water) at 25°C. The amount in kg of the crystals formed is________________________?


a0.4


b0.25


c0.2


d0.175


View Answer 0.2

Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the _______________ moisture?


aBound


bUnbound


cCritical


dNone of these


View Answer Bound

Which of the following is not a continuous drier ?


aDrum drier


bSpray drier


cTunnel drier


dTray drier


View Answer Tray drier

In an operating distillation column, the______________________?


aVapors and liquids are at their dew point and bubble point respectively


bDriving force for the liquid flow is its specific weight


cDriving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column


dHighest temperature is encountered at the top of the column



As per Gilliland’s equation, the diffusivity is___________________?


aDirectly proportional to ‘T1.5’


bInversely proportional to ‘P’


cDependent on the molecular volume & molecular weight of components


dAll A , B. & C.


View Answer All A , B. & C.

Pick out the wrong statement ?


aReboiler is not used in open steam distillation


bThe separation of solutes of different molecular sizes in a liquid solution by use of a suitable membrane is called dialysis


cFreeze drying is used for the drying of fish


dFenske-Underwood equation is used for calculating theoretical number of plates in a distillation column at normal operating reflux condition



Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the ________________ of a fibre ?


aElectrical resistance


bThermal conductivity


cStrength


dNone of these


View Answer Electrical resistance

Which is the controlling factor for a drum drier ?


aDiffusion


bHeat transfer


cBoth A. and B.


dNeither A. nor B.


View Answer Heat transfer

A minimum boiling azeotrope is exemplified by__________________________?


aToluene-benzene


bAcetone-carbon disulphide


cWater-isobutyl alcohol


dNone of these



Relative volatility does not change appreciably with the change in_____________________?


aTemperature


bVapour pressure of either component


cTotal pressure


dNone of these


View Answer Temperature

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