Chemical Engineering MCQs

Page No. 638

If moisture content of solid on dry basis is X, then the same on wet basis is____________________?


aX/(X + 1)


bX/(1 – X)


c(1 + X)/X


d(1 – X)/X


View Answer X/(X + 1)

For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because__________________?


aWater has a high latent heat of evaporation


bLewis number is close to unity


cThey are always equal under all circumstances


dSolubility of the components of air in water is very small



In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as_____________________?


aRi = Re/(1 – Re)


bRi = (1 – Re)/Re


cRi = Re


dRi = Re/(1 + Re)


View Answer Ri = Re/(1 + Re)

Separation of two or more components of a liquid solution cannot be achieved by___________________?


aFractional crystallisation


bLiquid extraction


cAbsorption


dEvaporation


View Answer Absorption

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when____________________?


aExtracting solvent is cheaply & abundantly available


bOne of the liquid components is heat sensitive


cViscosity of liquid components is very high


dOne of the liquid components has very high affinity towards the solvent



If the amount of the steam used in steam distillation is increased, the temperature of distillation__________________?


aIncreases


bDecreases


cRemains unchanged


dDepends on relative volatility


View Answer Decreases

An example of elution is______________________?


aSeparation of uranium oxide from its ore by H2SO4 in a Pachuca tank


bSeparation of sugar from sugar beet by hot water


cDissolution of tannin out of tree barks by water


dRecovery of vegetable oils from seeds



Pick out the wrong statement?


aThe binary diffusivity in liquids is of the order of 10-5 cm2/sec


bMolecular diffusion in solid is much faster than that in liquids


cParticles movement from higher concentration to lower concentration takes place in diffusion process


dAccording to Poiseuille’s law, the permeability decreases with increase in temperature for flow of a gas through a given capillary



Pick out the wrong statement pertaining to the cooling towers ?


aIn case of induced draft cooling tower, the fan is placed at the top of the tower


bEffectiveness of forced draft cooling tower is reduced by the recirculation of the humid and hot discharged air


cA natural draft cooling tower is recommended to be used, when the air humidity is low and air temperature is also low


dEffectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature



Pick out the wrong statement?


aChange in barometric pressure does not affect the relative humidity


bIn case of a packed tower, the operating velocity is about half of the flooding velocity, generally


c‘Elution’ means the desorption of the adsorbed solute by a solvent


dThe equilibrium moisture content of the solid can be reduced by increasing the absolute humidity



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