MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
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) = 0.2CA3A→C, (rC) = 0.1CA1 |
| A. | 20.4 |
| B. | 15.51 |
| C. | 32.56 |
| D. | 40.54 |
| Answer» C. 32.56 | |
| 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. |
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 | |
| 6. |
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 | |
| 7. |
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 | |
| 8. |
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 | |