Chemical Reaction Engineering Questions and Answers – Tanks in Series Model

This set of Chemical Reaction Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Tanks in Series Model”.

1. If τ is the average residence time and σ² is the standard deviation, then the number of tanks necessary to model a real reactor as N ideal tanks in series is ____
a) N = \(\frac{\tau^2}{σ^2} \)
b) N = \(\frac{σ^2}{τ^2} \)
c) N = σ²
d) N = \(\frac{1}{τ^2} \)
View Answer

2. State true or false.
The tank in series model is a single parameter model.
a) False
b) True
View Answer

3. 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
View Answer

4. 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_A = 1-\(\frac{1}{(1+\frac{τk}{N})^N} \)
b) X_A = 1+\(\frac{1}{(1+\frac{τk}{N})^N} \)
c) X_A = \(\frac{1}{(1+\frac{τk}{N})^N} \)
d) X_A = \(\frac{1}{(1+\frac{τk}{N})^N} \)– 1
View Answer

5. Which of the following correctly represents the Damkohler number for a first order reaction? (Where, τ is the space time)
a) k
b) τ
c) \(\frac{1}{kτ}\)
d) k τ
View Answer

6. 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
View Answer

7. If τ² = 100 and σ² = 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
View Answer

8. If τ = 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%
View Answer

9. The exit age distribution as a function of time is ____
a) E = \(\frac{t^{N-1}}{τ^N}\frac{N^N}{(N-1)!}e^\frac{-tN}{τ}\)
b) E = \(\frac{t^{N-1}}{τ^N}\frac{N}{(N-1)!}e^\frac{-tN}{τ}\)
c) E = \(\frac{t^N}{τ^N}\frac{N^N}{(N-1)!}e^\frac{-tN}{τ}\)
d) E = \(\frac{t^{N-1}}{τ^2}\frac{N^N}{(N-1)!}e^\frac{-tN}{τ}\)
View Answer

10. 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 5^th reactor in (\(\frac{mol}{m^3}\)) is ____
a) 0.34
b) 0.51
c) 0.65
d) 0.81
View Answer

Sanfoundry Global Education & Learning Series – Chemical Reaction Engineering.

To practice all areas of Chemical Reaction Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]