MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A reaction of first order takes 10 minutes to achieve 50% conversion. The conversion achieved after 20 minutes is ____ |
| A. | 0.5 |
| B. | 0.75 |
| C. | 0.87 |
| D. | 0.9 |
| Answer» C. 0.87 | |
| 2. |
For a first order liquid phase reaction occurring in a CSTR, the initial concentration is 10 \(\frac{mol}{m^3} \) and the final concentration is 5 \(\frac{mol}{m^3} \). If the residence time is 100 minutes, then the value of reaction rate is ____ |
| A. | 0.75 |
| B. | 0.33 |
| C. | 0.4 |
| D. | 0.05 |
| Answer» C. 0.4 | |
| 3. |
A liquid phase reaction occurring in a CSTR follows first order dynamics. The feed rate is 500m3/min. Initial concentration of the feed is 50mol/m3. If the reaction conversion is 50% and the reaction is carried out in a 0.5 m3 CSTR, what is the value of rate constant? |
| A. | 40 |
| B. | 20 |
| C. | 10 |
| D. | 5 |
| Answer» C. 10 | |
| 4. |
The present CSTR is replaced by another CSTR of double the volume. A first order liquid phase reaction occurs in both the reactors. If the conversion achieved in the old reactor is 75%, what is the conversion achieved in the new reactor? |
| A. | 0.857 |
| B. | 0.675 |
| C. | 0.765 |
| D. | 0.99 |
| Answer» B. 0.675 | |
| 5. |
A second order reaction occurs in a CSTR. Determine the ratio of volumes required for 45% conversion to 90% conversion, provided initial concentration, flow rate and other parameters are constant. |
| A. | 1.64 |
| B. | 60.5 |
| C. | 0.35 |
| D. | 0.0165 |
| Answer» C. 0.35 | |
| 6. |
The residence time (in min) for the reactants at a flow rate of 5 \(\frac{litre}{min}\) inside a reactor of volume 10 litre is ____ |
| A. | 5 |
| B. | 1 |
| C. | 10 |
| D. | 2 |
| Answer» E. | |
| 7. |
For a first order reaction, if the rate constant is 1 min-1 and the reaction time is 2 min, then the ratio of final to initial concentration is ____ |
| A. | 0.167 |
| B. | 0.135 |
| C. | 0.198 |
| D. | 0.764 |
| Answer» C. 0.198 | |
| 8. |
State true or false.For a first order reaction, the conversion of the reaction is a function of CA0. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
State true or false.For pure gaseous reactants, the best reactor suited for carrying out reaction is CSTR. |
| A. | True |
| B. | False |
| Answer» B. False | |