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. |
If for the parallel reactions A B and A C, if the final concentration of B is 26 mol/ L and A converted is 36 mol/L, then the final concentration of C is ____ |
| A. | 15 |
| B. | 5 |
| C. | 6 |
| D. | 10 |
| Answer» E. | |
| 2. |
The final concentration of product is related to the yield as ____ |
| A. | Final concentration = Yield Reactant fed |
| B. | Final concentration = Yield / Reactant fed |
| C. | Final concentration = Yield Reactant converted |
| D. | Final concentration = Yield / Reactant fed |
| Answer» D. Final concentration = Yield / Reactant fed | |
| 3. |
If CA0 = 20 mol/L and the initial concentration of the products B and C are 0, CA = 4 mol/L, then the final concentration of B in CSTR (in mol/L) is ____A B, (rB) = 0.2CA3 |
| A. | nA C, (r<sub>C</sub>) = 0.1C<sub>A</sub><sup>1</sup> |
| B. | 20.4 |
| C. | 15.51 |
| D. | 32.56 |
| E. | 40.54 |
| Answer» C. 15.51 | |
| 4. |
If A B, (rB) = k1CA2 and A C, (rC) = k2CA1, then the yield of C is ____ |
| A. | ( frac{k_2}{k_2+k_1 C_A} ) |
| B. | ( frac{k_2}{k_2+k_1} ) |
| C. | ( frac{1}{k_2+k_1 C_A} ) |
| D. | ( frac{k_2}{k_1 C_A} ) |
| Answer» B. ( frac{k_2}{k_2+k_1} ) | |
| 5. |
If the reactions A B and A C are represented as (-rA) = k1CA3 and (-rA) = k2CA6 of activation energies 130 and 150 J/ mol, then which of the following is the right selection of process parameters to increase selectivity of B? |
| A. | CSTR, High temperature |
| B. | PFR, High temperature |
| C. | CSTR, Low temperature |
| D. | PFR, Low temperature |
| Answer» D. PFR, Low temperature | |
| 6. |
For the parallel reaction, A B, represented as (-rA) = k1CA5 and A C represented as (-rA) = k2CA3, theideal reactor preferred is ____ |
| A. | CSTR |
| B. | CSTRs in parallel |
| C. | CSTRs in series |
| D. | PFR |
| Answer» E. | |
| 7. |
For the parallel reaction, A B of order n1 and A C of order n2, if B is the desired product, then which of the following reactor/ combination of reactors is used if n1 > n2? |
| A. | CSTR |
| B. | CSTR followed by Bubbling bed reactor |
| C. | PFR |
| D. | CSTR followed by PFR |
| Answer» D. CSTR followed by PFR | |
| 8. |
For the parallel reaction, A B and A C, if B is the desired product and the reaction A B is of positive order n1 and C is the undesired product and the reaction A C is of negative order n2, then increasing the concentration of A _____ |
| A. | Decreases desired product selectivity |
| B. | Increases desired product selectivity |
| C. | Initially increases and then decreases desired product selectivity |
| D. | Does not affect desired product selectivity |
| Answer» C. Initially increases and then decreases desired product selectivity | |
| 9. |
The reaction yield is defined as the ratio of ____ |
| A. | Moles of reactant reacted to the moles of product formed |
| B. | Moles of product formed to the moles of reactant reacted |
| C. | Moles of desired product formed to the moles of undesired material formed |
| D. | Moles of product formed to the moles of reactant fed |
| Answer» C. Moles of desired product formed to the moles of undesired material formed | |
| 10. |
Selectivity in parallel reactions is defined as the ratio of___ |
| A. | Moles of desired product formed to the moles of undesired material formed |
| B. | Moles of undesired product formed to the moles of desired material formed |
| C. | Moles of product formed to the moles of reactant consumed |
| D. | Moles of reactant consumed to the moles of product formed |
| Answer» B. Moles of undesired product formed to the moles of desired material formed | |