MCQOPTIONS
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MCQOPTIONS
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 | |
| 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}{ } ) | |
| 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% | |
| 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 | |
| 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 | |
| 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. | |
| 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} ) | |
| 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 | |
| 9. |
State true or false.The tank in series model is a single parameter model. |
| A. | False |
| B. | True |
| Answer» C. | |
| 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} ) | |