Chemical Engineering MCQs

Page No. 654

In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions: (i) Reflux stream is completely liquid and is at its bubble point. (ii) Reflux stream is below its bubble point ?


aCondenser and reboiler loads are the same in both the cases


bReboiler load is the same in both the cases but condenser load is higher in case (ii)


cCondenser load is the same in both the cases but reboiler load is higher in case (ii)


dBoth condenser and reboiler loads are higher in case (ii) as compared to case (i)



_______________ column is used in gas absorption process ?


aWetted wall


bSieve/perforated tray


cBubble cap


dPacked


View Answer Packed

The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is___________________?


a2.09 × 10-4


b2.09 × 10-5


c2.09 × 10-9


d2.09 × 10-12


View Answer 2.09 × 10-4

The ‘shanks system’ of leaching (i.e., counter-current multiple contact leaching) is used for____________________?


aRecovery of tannis from the tree barks and woods


bLeaching sodium nitrate from Chilean nitrate bearing rock


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Which of the following employs an accessory known as ‘drift eliminator’ ?


aMultiple effect evaporator


bMechanical draft cooling tower


cRotary dryer


dRotating disc contactor



The term “approach” in a cooling tower refers to the difference in the temperature of the____________________?


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 and the cooled water leaving the cooling tower


dNone of these



Below is given an equilibrium moisture curve of a substance. State which regions represent free moisture and unbound moisture respectively ?


aII, III


bII, IV


cIV, III


dIV, II


View Answer II, III

Humid volume, at a given temperature is a/an _______________ function of humidity?


aInverse


bExponential


cLinear


dLogarithmic


View Answer Linear

Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is _______________ the liquid head available in the downcomer?


aLess than


bMore than


cSame as


dVery much less


View Answer More than

Which of the following is an undesirable characteristic for the solvent used in gas absorption ?


aLow vapor pressure


bLow viscosity


cHigh gas solubility


dNone of these


View Answer None of these

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