Chemical Engineering MCQs

Page No. 563

For any reaction, we may write conversion as a function of______________________?


aTime


bTemperature


cConcentration


dAll A., B. & C.


View Answer All A., B. & C.

When a high liquid hold up is required in a reactor for gas liquid reaction, use ______________ column?


aPacked


bSpray


cTray


dBubble


View Answer Bubble

Helium-mercury method is used for the measurement of the ________________ of the catalyst?


aSurface area


bPorosity


cPore volume


dBoth B. & C.


View Answer Both B. & C.

With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will________________?


aIncrease


bDecrease


cRemain same


dData in insufficient; can’t be predicted


View Answer Increase

If the rate of a chemical reaction becomes slower at a given temperature, then the__________________?


aInitial concentration of the reactants remains constant


bFree energy of activation is lower


cEntropy changes


dFree energy of activation is higher



For an isothermal variable volume batch reactor, the following relation is applicable for a first order irreversible reaction?


aXA = k . t


b[CA0/(1 + εA XA)] (dXA/dt) = k


c-ln(1 – XA) = kt


dεA . ln (1 – XA) = k . t



Which of the following is a characteristic of an ideal plug flow reactor ?


aAxial dispersion


bFlat velocity profile


cUniform mixing


dNone of these


View Answer Flat velocity profile

What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction ?


a0


b1


c2


d3


View Answer 0

Collision theory gives the rate constant for bimolecular reaction as___________________?


aK α √T.e-E/RT


bK α eE/RT


cK α e-E/RT


dNone of these


View Answer K α e-E/RT

For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant ?


aIs independent of pressure


bIncreases with pressure


cDecreases with pressure


dIncreases /decreases with pressure depending on the stoichiometric co-efficients of the reaction



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