Chemical Engineering MCQs

Page No. 566

6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant ?


a100%


b95%


c75%


d20%


View Answer 95%

A first order reaction requires two equal sized CSTR. The conversion is____________________?


aLess when they are connected in series


bMore when they are connected in series


cMore when they are connected in parallel


dSame whether they are connected in series or in parallel



The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the_________________?


aSpace time for each parallel line is same


bSpace time for parallel lines is different


cLarger reactors have more space time compared to smaller ones


dNone of these



What is the order of a chemical reaction of the bellow figure, if the rate of formation of ‘C’, increases by a factor of 2.82 on doubling the concentration of ‘A’ and increases by a factor of 9 on trebling the concentration of ‘B’ ?


a7/2


b7/4


c5/2


d5/4


View Answer 7/2

Higher free energy of activation of a chemical reaction (at a given temperature) implies ____________________?


aSlower rate of reaction


bHigher rate of reaction


cHigher equilibrium conversion


dBoth B. and C.



As the chemical reaction proceeds, the rate of reaction ___________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease depending on the type of reaction


View Answer Decreases

Integral method for analysing the kinetic data is used _____________________?


aWhen the data are scattered


bFor testing specific mechanisms with simple rate expressions


cBoth A. and B.


dNone of these


View Answer Both A. and B.

A pulse tracer is introduced in an ideal CSTR (with a mean residence time I) at time, t = 0. The time taken for the exit concentration of the tracer to reach half of its initial value will be__________________?


a


b0.5η


cη/0.693


d0.693η


View Answer

Inversion of cane sugar is an example of ______________________?


aUnimolecular reaction with first order


bBimolecular reaction with second order


cBimolecular reaction with first order


dUnimolecular reaction with second order



A typical example of an exothermic reversible reaction conducted at high pressure in industry is____________________?


aDehydration of ethanol


bMethanol synthesis


cReformation of methane


dPolymerisation of ethylene



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