MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
The activity of a catalyst at a time t = 0 is ____ |
| A. | Negative |
| B. | Zero |
| C. | Unity |
| D. | ∞ |
| Answer» D. ∞ | |
| 2. |
If the rate of deactivation is given by –\(\frac{da}{dt}\) = 0.0064 day-1, the expression relating activity and time is ___ |
| A. | a = 0.0064t |
| B. | a = 1-0.0064t |
| C. | a = t |
| D. | a = 0.0064-t |
| Answer» C. a = t | |
| 3. |
The slope of the curve of ln\((ln\frac{C_A}{C_{A∞}})\) and t for batch solid – fluid independent deactivation system is ___ |
| A. | ln(lnkd) |
| B. | ln(kd) |
| C. | kd |
| D. | ln(kd)c) kdd) -kd |
| Answer» E. | |
| 4. |
The rate expression for independent deactivation for batch solids is ____ |
| A. | ln\((ln\frac{C_A}{C_{A∞}})\) = ln \(\frac{Wk’}{Vk_d}\) – kdt |
| B. | ln \(\frac{C_A}{C_{A∞}}\) = ln \(\frac{Wk’}{Vk_d}\) – kdt |
| C. | lnln \(\frac{C_A}{C_{A∞}}\) = ln \(\frac{Wk’}{Vk_d}\) |
| D. | lnln \(\frac{C_A}{C_{A∞}}\) = \(\frac{Wk’}{Vk_d}\) – kdt |
| Answer» B. ln \(\frac{C_A}{C_{A∞}}\) = ln \(\frac{Wk’}{Vk_d}\) – kdt | |
| 5. |
Which of the following reactor arrangements causes fast deactivation? |
| A. | Mixed flow for fluid |
| B. | Plug flow for fluid |
| C. | Fluidised bed reactor |
| D. | Batch for fluid and solid |
| Answer» D. Batch for fluid and solid | |
| 6. |
If kd is the rate constant of deactivation and d is the order of deactivation, then the rate equations representing independent deactivation are ___ |
| A. | -r’A = k’CAna–\(\frac{da}{dt}\) = kdad |
| B. | -r’A = k’a–\(\frac{da}{dt}\) = kdad |
| C. | -r’A = k’CAna–\(\frac{da}{dt}\) = kd |
| D. | -r’A = k’CAn–\(\frac{da}{dt}\) = kdad |
| Answer» B. -r’A = k’a–\(\frac{da}{dt}\) = kdad | |
| 7. |
The activity of a catalyst pellet is defined as the ratio of ___ |
| A. | Rate of adsorption of reactants to the catalyst surface to the rate at which the catalytic pellet converts the reactant |
| B. | Rate at which the catalytic pellet converts the reactant to the rate of adsorption of reactants to the catalyst surface |
| C. | Rate at which the catalytic pellet converts the reactant to the rate of reaction with a fresh pellet |
| D. | The rate of reaction with a fresh pellet to the rate at which the catalytic pellet converts the reactant |
| Answer» D. The rate of reaction with a fresh pellet to the rate at which the catalytic pellet converts the reactant | |
| 8. |
Which of the following represents series type deactivation model? (Where R is the product and P is the poison) |
| A. | A → R → P↓ |
| B. | A → P↓ |
| C. | A → R + P↓ |
| D. | A → R, A → P |
| Answer» B. A → P↓ | |
| 9. |
The catalyst deactivation caused by deposition on surface and pores of catalyst is called ____ |
| A. | Adsorption |
| B. | Regeneration |
| C. | Fouling |
| D. | Desorption |
| Answer» D. Desorption | |
| 10. |
State true or false.In parallel deactivation, the reactant produces a side product which deposits on the catalytic surface and deactivates it. |
| A. | True |
| B. | False |
| Answer» B. False | |