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.

There are 5 tanks connected in series. If the average residence time is 5 sec, first order rate constant is 0.5 sec-1, the initial concentration is 5 ( frac{mol}{m^3}, ) then the conversion at the exit of 5th reactor in ( ( frac{mol}{m^3} )) is ____

A. 0.34
B. 0.51
C. 0.65
D. 0.81
Answer» D. 0.81
Discussion
2.

The exit age distribution as a function of time is ____

A. E = ( frac{t^{N-1}}{ ^N} frac{N^N}{(N-1)!}e^ frac{-tN}{ } )
B. E = ( frac{t^{N-1}}{ ^N} frac{N}{(N-1)!}e^ frac{-tN}{ } )
C. E = ( frac{t^N}{ ^N} frac{N^N}{(N-1)!}e^ frac{-tN}{ } )
D. E = ( frac{t^{N-1}}{ ^2} frac{N^N}{(N-1)!}e^ frac{-tN}{ } )
Answer» B. E = ( frac{t^{N-1}}{ ^N} frac{N}{(N-1)!}e^ frac{-tN}{ } )
Discussion
3.

If = 5 s, first order rate constant, k = 0.25 sec-1 and the number of tanks, N is 5, then the conversion is ____

A. 67.2%
B. 75%
C. 33%
D. 87.45%
Answer» B. 75%
Discussion
4.

If 2 = 100 and 2 = 10, the number of tanks necessary to model a real reactor as N ideal tanks in series is ____

A. 1
B. 10
C. 5
D. 100
Answer» C. 5
Discussion
5.

According to tanks in series model, the spread of the tracer curve is proportional to ____

A. Square of distance from the tracer origin
B. Square root of distance from the tracer origin
C. Cube of distance from the tracer origin
D. Inverse square of distance from the tracer origin
Answer» C. Cube of distance from the tracer origin
Discussion
6.

Which of the following correctly represents the Damkohler number for a first order reaction? (Where, is the space time)

A. k
B.
C. ( frac{1}{k } )
D. k
Answer» E.
Discussion
7.

For a first order reaction, where k is the first order rate constant, the conversion for N tanks in series is obtained as ____

A. X<sub>A</sub> = 1- ( frac{1}{(1+ frac{ k}{N})^N} )
B. X<sub>A</sub> = 1+ ( frac{1}{(1+ frac{ k}{N})^N} )
C. X<sub>A</sub> = ( frac{1}{(1+ frac{ k}{N})^N} )
D. X<sub>A</sub> = ( frac{1}{(1+ frac{ k}{N})^N} ) 1
Answer» B. X<sub>A</sub> = 1+ ( frac{1}{(1+ frac{ k}{N})^N} )
Discussion
8.

State true or false.
The tank in series model depicts a non ideal tubular reactor as a series of equal sized CSTRs.

A. True
B. False
Answer» B. False
Discussion
9.

State true or false.
The tank in series model is a single parameter model.

A. False
B. True
Answer» C.
Discussion
10.

If is the average residence time and 2 is the standard deviation, then the number of tanks necessary to model a real reactor as N ideal tanks in series is ____

A. N = ( frac{ tau^2}{ ^2} )
B. N = ( frac{ ^2}{ ^2} )
C. N = <sup>2</sup>
D. N = ( frac{1}{ ^2} )
Answer» B. N = ( frac{ ^2}{ ^2} )
Discussion