MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In fluidised-bed dryers, a separate component is provided in which the solids move sequentially from the inlet to outlet, such setup is known as ______________ where the residence time is more or less the same for all particles in that compartment. |
| A. | Drum dryers |
| B. | Plug flow dryers |
| C. | Fluidised bed dryers |
| D. | Rotary dryers |
| Answer» C. Fluidised bed dryers | |
| 2. |
Fluidised bed dryers work best with which of the following bed material? |
| A. | Crystalline granular solids |
| B. | Finely divided solids |
| C. | Powdered substance |
| D. | Large pellet shaped |
| Answer» B. Finely divided solids | |
| 3. |
For a fluidised bed dryer, which one of the following is correct? |
| A. | Dry hot air is passed as the fluid on a bed of wet material |
| B. | Hot fluid outside the tube containing particles |
| C. | Wet hot air is passed as the fluid on a bed of dry material |
| D. | Dry hot air is passed as the fluid on a packed bed of wet material |
| Answer» B. Hot fluid outside the tube containing particles | |
| 4. |
Which one of the following is not an advantage of flash dryers? |
| A. | Low residence time |
| B. | High drying rate |
| C. | The thermal efficiency this type of dryer is high |
| D. | No separate arrangement is required for transporting the dried product |
| Answer» D. No separate arrangement is required for transporting the dried product | |
| 5. |
Which one of the following dryers have high drying rate but low residence time? |
| A. | Furnace Dryer |
| B. | Drum Dryer |
| C. | Flash Dryer |
| D. | Rotary Dryer |
| Answer» D. Rotary Dryer | |
| 6. |
Which one of the following dryers are best suited for drying of heat sensitive or easily oxidizable materials? |
| A. | Furnace |
| B. | Drum |
| C. | Flash |
| D. | Rotary |
| Answer» D. Rotary | |
| 7. |
A flash dryer is similar in its operation to a _________ as the feed is dispersed finely in an upward flowing hot air. |
| A. | Agitated dryer |
| B. | Drum dryer |
| C. | Rotary dryer |
| D. | Spray dryer |
| Answer» E. | |
| 8. |
Which one of the following is the most flexible continuous flow dryer? |
| A. | Agitated dryer |
| B. | Drum dryer |
| C. | Rotary dryer |
| D. | Furnace dryer |
| Answer» C. Rotary dryer | |
| 9. |
Drum dryer mainly handles the materials that are too thick for a spray dryer and too thin for a rotary dryer. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
For a single drum, the thickness of the film can be controlled by ___________ and in case of a double drum setup the thickness of product here can be controlled by ______________ |
| A. | An adjustable scraping blade, the gap between the drums |
| B. | The drums, the fins |
| C. | The Gap between the drums, an adjustable scraping blade |
| D. | The fins, the drums |
| Answer» B. The drums, the fins | |
| 11. |
In a drum dryer, the thickness of the slurry layer cannot be controlled. |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
Which dryer has the following description – ‘a liquid containing dissolved solids or slurry carrying suspended solids forms a thin layer on the outside surface of a large rotating vessel’? |
| A. | Agitated dryer |
| B. | Drum dryer |
| C. | Rotary dryer |
| D. | Furnace dryer |
| Answer» C. Rotary dryer | |
| 13. |
The number of possible heat transfer units in a rotary dryer is approximately ___________ |
| A. | 2.0 – 3.0 |
| B. | 1.5 – 2.0 |
| C. | 2.5 – 6.5 |
| D. | 6.5 – 9.5 |
| Answer» C. 2.5 – 6.5 | |
| 14. |
The moist feed is fed in at the _________ end of a rotary dryer and the material progresses to the ________ end, where it gets discharged. |
| A. | Upper and Lower |
| B. | Lower and Upper |
| C. | Lower and Lower |
| D. | Upper and Upper |
| Answer» B. Lower and Upper | |
| 15. |
Which one of the following is not a continuous feed dryer? |
| A. | Agitated |
| B. | Rotary |
| C. | Drum |
| D. | Flash |
| Answer» B. Rotary | |