MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 9 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. |
Which of the following is true about a reverse cyclone used for freeing a fluidized bed of the entrained particles? |
| A. | It consists of an inlet connected axially to the dipleg |
| B. | Outlet tube extends from the bottom of the barrel section |
| C. | Gases exit from the dipleg while the particle leave from outlet tube |
| D. | Centrifugal forces cause gas-solid separation |
| Answer» E. | |
| 2. |
Which of the following is not a cause of particle attrition in fluidized beds? |
| A. | When gas jets are placed far |
| B. | When gas jets leaving the distributor intersect |
| C. | High velocity jets cause particles to collide |
| D. | When particle carried by swishing gas flow collide |
| Answer» B. When gas jets leaving the distributor intersect | |
| 3. |
Which of the following is the correct equation for pressure drop over orifices when the bed height is greater than 0.3 m? |
| A. | P<sub>orifice</sub> ( frac {1}{3} ) H<sub>bed</sub> ( frac {g}{gc} ) <sub>bulk</sub> |
| B. | P<sub>orifice</sub> ( frac {2}{3} ) H<sub>bed</sub> ( frac {g}{gc} ) <sub>bulk</sub> |
| C. | P<sub>orifice</sub> ( frac {1}{3} ) H<sub>bed</sub> ( frac {g}{gc} ) <sub>bulk</sub> |
| D. | P<sub>orifice</sub> ( frac {2}{3} ) H<sub>bed</sub> ( frac {g}{gc} ) <sub>bulk</sub> |
| Answer» D. P<sub>orifice</sub> ( frac {2}{3} ) H<sub>bed</sub> ( frac {g}{gc} ) <sub>bulk</sub> | |
| 4. |
Which of the following characteristic part of a fluidized system is not needed in every system designed? |
| A. | Particle bed region |
| B. | A gas distributor |
| C. | Plenum |
| D. | Heating and cooling coils |
| Answer» E. | |
| 5. |
Crush strength of a particle is an indication of the particle s attrition properties which are necessary to study attrition and erosion of the fluidized bed. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
Which of the following is true about gas distribution in fluidized beds? |
| A. | Proper gas distribution is independent of the orifice diameters |
| B. | Low grid pressure drop ensures uniform gas distribution |
| C. | Particle weeping can be limited by keeping the pressure drop over orifices above a particular minimum value |
| D. | Ideal pressure drop across a grid plate should be lesser than 4,500 Pa |
| Answer» D. Ideal pressure drop across a grid plate should be lesser than 4,500 Pa | |
| 7. |
Fluidized beds cannot be used as dryers. |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
Which of the following is not a correct characteristic of Fluidized system? |
| A. | Liquid like behavior |
| B. | Cannot resist temperature change |
| C. | Easy control |
| D. | Rapid mixing is also possible |
| Answer» C. Easy control | |
| 9. |
Which of the following liquid like properties is correct about fluidized beds? |
| A. | Heavier particles float on the top |
| B. | Have a non-static pressure head |
| C. | Assume the shape of the container that contains it |
| D. | Non zero angle of repose |
| Answer» D. Non zero angle of repose | |