Chemical Engineering MCQs

Page No. 685

In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of _______________ is zero?


aInterface


bGas phase


cLiquid phase


dAll A , B. & C.


View Answer Interface

Which of the following is used for the concentration of rubber latex ?


aAgitated film evaporator


bLong tube vertical evaporator


cShort tube evaporator


dCalandria



Operating velocity in a packed tower is usually __________________ the flooding velocity ?


aHalf


bTwice


cEqual to


dMore than


View Answer Half

For stripping of a gas in a counter current stripper, the operating line _____________________?


aLies above the equilibrium curve


bLies below the equilibrium curve


cCan lie above or below the equilibrium curve


dIs always parallel to the equilibrium curve



In gas-liquid contact operation, the number of ideal stages, N = (xa – xb)/(xb – x*b). This is true when the stripping factor ‘S’ is ________________?


aS > 1


bS < 1


cS = 1


dS = ∞


View Answer S > 1

The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?


a100


b10


c5


d1


View Answer 10

Large scale usage of flash distillation is practised in __________________?


aSoap manufacturing


bAmmonia synthesis plant


cPolymerisation industry


dPetroleum refining


View Answer Petroleum refining

The boiling points of pure components of a binary system ________________ with increase in total pressure of the system ?


aDecreases


bIncreases


cRemains unchanged


dMay increase or decrease, depends on the system


View Answer Increases

During sensible cooling process ______________________?


aRelative humidity decreases


bRelative humidity increases


cWet bulb temperature decreases


dBoth B. and C.


View Answer Both B. and C.

The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if___________________?


aNSc = 1


bNSc = NPr = NLe


cNPr = NLe


dNSc = NLe


View Answer NSc = NPr = NLe

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