Explore topic-wise MCQs in Chemical Reaction Engineering.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Reaction Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

If Da is the Damkohler number, for equal sized CSTRs in series carrying out first order reaction, the plot representing conversion and number of CSTRs is ____

A. <img alt="Plot representing conversion &amp; number of CSTRs if Da is the Damkohler number - option a" class="alignnone size-full wp-image-283981" height="257" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q10a.png" width="285"/>
B. <img alt="Plot representing conversion &amp; number of CSTRs if Da is the Damkohler number - option b" class="alignnone size-full wp-image-283995" height="263" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q10b.png" width="260"/>
C. <img alt="Plot representing conversion &amp; number of CSTRs if Da is the Damkohler number - option c" class="alignnone size-full wp-image-283994" height="251" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q10c.png" width="292"/>
D. <img alt="Plot representing conversion &amp; number of CSTRs if Da is the Damkohler number - option d" class="alignnone size-full wp-image-283993" height="254" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q10d.png" width="282"/>
Answer» C. <img alt="Plot representing conversion &amp; number of CSTRs if Da is the Damkohler number - option c" class="alignnone size-full wp-image-283994" height="251" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q10c.png" width="292"/>
Discussion
2.

For equal sized CSTRs in series carrying out 1st order reaction, the concentration at the outlet of nth reactor is ____

A. C<sub>N</sub> = ( frac{1}{(1 + k)^N} )
B. C<sub>N</sub> = ( frac{C_0}{(1 + )^N} )
C. C<sub>N</sub> = ( frac{C_0}{(1 + k)^N} )
D. C<sub>N</sub> = ( frac{C_0}{(1 + k)^N} )
Answer» E.
Discussion
3.

State true or false.
For different sized CSTRs in series, the best system is the one having a minimum volume for a specific conversion.

A. True
B. False
Answer» B. False
Discussion
4.

For very low conversion, the value of Damkohler number is ____

A. 0.1
B. &gt;10
C. 0.1
D. = 10
Answer» B. &gt;10
Discussion
5.

For equal sized CSTRs in series carrying out 1st order reactions of constant density, which of the following is true? (ki is the rate constant in a reactor i in series)

A. k<sub>1</sub> k<sub>2</sub> k<sub>n</sub>, <sub>1</sub> = <sub>2</sub> = = <sub>n</sub>
B. k<sub>1</sub> = k<sub>2</sub> = = k<sub>n</sub>, <sub>1</sub> = <sub>2</sub> = = <sub>n</sub>
C. k<sub>1</sub> = k<sub>2</sub> = = k<sub>n</sub>, <sub>1</sub> <sub>2</sub> <sub>n</sub>
D. k<sub>1</sub>&lt; k<sub>2</sub>&lt; &lt;k<sub>n</sub>, <sub>1</sub> = <sub>2</sub> = = <sub>n</sub>
Answer» C. k<sub>1</sub> = k<sub>2</sub> = = k<sub>n</sub>, <sub>1</sub> <sub>2</sub> <sub>n</sub>
Discussion
6.

The plot of rate of the reaction and the reactant concentration for unequal sized CSTRs in series is ____

A. <img alt="Plot of rate of reaction &amp; reactant concentration for unequal sized CSTRs - option a" class="alignnone size-full wp-image-283985" height="249" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q5a.png" width="259"/>
B. <img alt="Plot of rate of reaction &amp; reactant concentration for unequal sized CSTRs - option b" class="alignnone size-full wp-image-283984" height="244" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q5b.png" width="257"/>
C. <img alt="Plot of rate of reaction &amp; reactant concentration for unequal sized CSTRs - option c" class="alignnone size-full wp-image-283983" height="241" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q5c.png" width="254"/>
D. <img alt="Plot of rate of reaction &amp; reactant concentration for unequal sized CSTRs - option d" class="alignnone size-full wp-image-283982" height="249" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q5d.png" width="255"/>
Answer» B. <img alt="Plot of rate of reaction &amp; reactant concentration for unequal sized CSTRs - option b" class="alignnone size-full wp-image-283984" height="244" src="https://www.sanfoundry.com/wp-content/uploads/2020/07/chemical-reaction-engineering-questions-answers-design-cstrs-series-q5b.png" width="257"/>
Discussion
7.

What is the concentration C4 at the end of 4th reactor, for n unequal sized CSTRs in series, where X4 is the conversion in 4th reactor?

A. C<sub>4</sub> = (1 X<sub>4</sub>)
B. C<sub>4</sub> = C<sub>0</sub>X<sub>4</sub>
C. C<sub>0</sub> = C<sub>4</sub> (1 X<sub>4</sub>)
D. C<sub>4</sub> = C<sub>0</sub>(1 X<sub>4</sub>)
Answer» E.
Discussion
8.

For i CSTRs of variable volume in series, the residence time in the ith reactor is ____

A. <sub>i</sub> = ( frac{- C_i}{-r_i} )
B. <sub>i</sub> = ( frac{C_{i-1}- C_i}{-r_i} )
C. <sub>i</sub> = ( frac{C_i}{-r_i} )
D. <sub>i</sub> = ( frac{C_{i-1}}{-r_i} )
Answer» C. <sub>i</sub> = ( frac{C_i}{-r_i} )
Discussion
9.

What is the mole balance of a component in a CSTR? (Where F0 is the molar flowrate of reactant entering and F is the exit molar flowrate)

A. F<sub>0</sub> = FX + F
B. F<sub>0</sub> = FX + F<sub>0</sub>
C. F<sub>0</sub> = F<sub>0</sub>X + F
D. F<sub>0</sub> = X + F
Answer» D. F<sub>0</sub> = X + F
Discussion
10.

State true or false.
It is preferable to use a number of CSTRs in series to achieve a specific conversion than a single CSTR.

A. True
B. False
Answer» B. False
Discussion