MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Operations knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Water was used as the fluid in a fluidized bed. The length of the fluidization column was 1000mm. The manometer readings were 26 cm and 24 cm. Calculate the pressure difference per length of column. Acceleration due to gravity is used as 9.8 m/s2. |
| A. | 198 kg/m2s2 |
| B. | 196 kg/m2s2 |
| C. | 200 kg/m2s2 |
| D. | 194 kg/m2s2 |
| Answer» C. 200 kg/m2s2 | |
| 2. |
Calculate the initial porosity of the bed given that the void volume is 0.8901 and the total volume is 1.1. |
| A. | 0.9791 |
| B. | 0.2099 |
| C. | 1.2358 |
| D. | 0.8092 |
| Answer» E. | |
| 3. |
Which of the following happens when the gas velocity increases in fluidization? |
| A. | Bulk density of the increases and fluidization become less aggressive |
| B. | Bulk density of the decreases and fluidization become less aggressive |
| C. | Bulk density of the increases and fluidization become more aggressive |
| D. | Bulk density of the decreases and fluidization become more aggressive |
| Answer» E. | |
| 4. |
Which of the following is false about the Huttlin – Kugel coater? |
| A. | It does not consist of central processor |
| B. | Spray nozzles cannot be located at the bottom |
| C. | The product container is spherical |
| D. | Fluidized air passes through the center of product container |
| Answer» C. The product container is spherical | |
| 5. |
Which of the following is true about Wurster fluid system’s coating process? |
| A. | Inner partition has a diameter that is approximately 30% of the coating chamber’s diameter |
| B. | Air distribution plate has holes drilled of equal sizes all over the plate |
| C. | Spray nozzle is located at the center of the plate |
| D. | Wurster fluid bed was designed in 1850 |
| Answer» D. Wurster fluid bed was designed in 1850 | |
| 6. |
Calculate the porosity of the bed when the initial bed height is 24.5 cm, the final bed height is 34.5 cm and initial porosity is 0.2036. |
| A. | 0.634 |
| B. | 0.534 |
| C. | 0.434 |
| D. | 0.334 |
| Answer» D. 0.334 | |
| 7. |
Which of the following parts of a fluidized system separates the product from air? |
| A. | Filter bags |
| B. | Air handler |
| C. | High shear mixer |
| D. | Distributor plate |
| Answer» B. Air handler | |
| 8. |
Arrange the following stages of fluidization in the increasing order of gas flow. |
| A. | i, ii, iii, iv |
| B. | i, iii, ii, iv |
| C. | I, iv, iii, ii |
| D. | I, iv, ii, iiiView Answer |
| Answer» C. I, iv, iii, ii | |
| 9. |
When does slugging occur in fluidization? |
| A. | When height of the bed is greater than diameter of the bed |
| B. | When height of the bed is shorter than diameter of the bed |
| C. | When height of the bed is equal to the diameter of the bed |
| D. | Slugging does not depend on the ratio of height of bed and diameter of bed |
| Answer» B. When height of the bed is shorter than diameter of the bed | |
| 10. |
How do solids behave like fluids in fluidization? |
| A. | Solids behave like fluids by blowing liquid downwards through the reactor |
| B. | Solids behave like fluids by blowing gas upwards through the reactor |
| C. | Solids behave like fluids by blowing gas or liquid downwards through the reactor |
| D. | Solids behave like fluids by blowing gas or liquid upwards through the reactor |
| Answer» E. | |