MCQOPTIONS
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MCQOPTIONS
This section includes 11 Mcqs, each offering curated multiple-choice questions to sharpen your Mass Transfer knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Find the region if the final and the initial moisture content are 40% and 30% (Dry basis) and the critical moisture content is 45%. |
| A. | Constant rate |
| B. | Falling rate |
| C. | Internal movement |
| D. | None of the mentioned |
| Answer» C. Internal movement | |
| 2. |
Falling rate period of the batch drying curve = _______ + ___________ |
| A. | Internal movement, unsaturated surface drying |
| B. | Internal movement, saturated surface drying |
| C. | External movement, unsaturated surface drying |
| D. | External movement, saturated surface drying |
| Answer» B. Internal movement, saturated surface drying | |
| 3. |
There will be a change in the rate of drying of a batch process after the constant drying process. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
If the time taken for the moisture removal is obtained from the formulaTime = Ss(Xc Xe)/ Nc * A ln ((X1-Xe)/(X2-Xe)) then the falling curve will be curves symmetrically |
| A. | nWhere, Ss= Wet solid weight |
| B. | n Xc,Xe- constant & equilibrium moisture content |
| C. | n X1,X2 initial and final moisture content |
| D. | True |
| E. | False |
| Answer» C. n X1,X2 initial and final moisture content | |
| 5. |
Falling rate period of a batch process starts at |
| A. | Saturated drying surface |
| B. | Unsaturated drying surface |
| C. | Both unsaturated and saturated region |
| D. | None of the mentioned |
| Answer» C. Both unsaturated and saturated region | |
| 6. |
Find the final moisture content for the batch process if the initial moisture content is 75% (dry basis) and the constant moisture content is 40%. (Includes constant and falling rate period) |
| A. | 45 |
| B. | 50 |
| C. | 60 |
| D. | None of the mentioned |
| Answer» E. | |
| 7. |
Find the initial moisture content for the batch process if the final moisture content is 25% (dry basis) and the constant moisture content is 40%. (Includes constant and falling rate period) |
| A. | 35 |
| B. | 30 |
| C. | 60 |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 8. |
At the constant drying period of a batch process, the rate of drying varies accordingly. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Find the period if the initial and the final moisture content are 50% and 20%. Also the critical moisture content is 30%. |
| A. | Constant rate period |
| B. | Falling rate period |
| C. | saturated period |
| D. | None of the mentioned |
| Answer» C. saturated period | |
| 10. |
Find the period if the initial and the final moisture content are 60% and 40%. Also the critical moisture content is 30%. |
| A. | Constant rate period |
| B. | Falling rate period |
| C. | Unsaturated period |
| D. | None of the mentioned |
| Answer» B. Falling rate period | |
| 11. |
Find the time taken to dry 50% to 40% of moisture (dry basis) if critical moisture content is 30%. If the weight of the wet solid is 5 kg and the product of area and the constant rate is 0.5 kg/min. |
| A. | 20 sec |
| B. | 40 sec |
| C. | 60 sec |
| D. | 80 sec |
| Answer» D. 80 sec | |