Chemical Engineering MCQs

Page No. 636

_____________ temperature is the steady state temperature attained by a small amount of liquid evaporating into a large quantity of unsaturated gas-vapor mixture ?


aDry bulb


bWet bulb


cDew point


dNone of these


View Answer Wet bulb

Heat load in a cooling tower______________________?


aMeans the amount of heat thrown away (KCal/hr.) by the cooling tower


bIs equal to the number of kg, of water circulated times the cooling range


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

A good solvent used for absorption should not have very high____________________?


aViscosity


bVapor pressure


cFreezing point


dAll A., B. & C.


View Answer All A., B. & C.

Dew point of a gas-vapour mixture_____________________?


aIncreases with temperature rise


bDecreases with temperature rise


cDecreases with decrease in pressure


dIncreases with increase in pressure



Deaeration (removal of O2) of water is done by_________________?


aRectification


bAbsorption


cIon-exchange


dAdsorption


View Answer Ion-exchange

For _______________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same?


aUnsaturated surface


bConstant rate


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Rate of leaching increases with increasing______________________?


aTemperature


bViscosity of solvent


cPressure


dSize of the solid


View Answer Temperature

The term “cooling range” in a cooling tower refers to the difference in the temperature of____________________?


aCold water leaving the tower and the wet bulb temperature of the surrounding air


bHot water entering the tower and the wet bulb temperature of the surrounding air


cHot water entering the tower and the cooled water leaving the tower


dNone of these



When the liquid over a plate is of uniform concentration, then ______________________?


aMurphree efficiency > point efficiency


bMurphree efficiency < point efficiency


cMurphree efficiency = point efficiency


dMurphree efficiency ≠ point efficiency



The dimension of diffusivity is same as that of the__________________?


aDensity


bMolal concentration


cKinematic viscosity


dVelocity head


View Answer Kinematic viscosity

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