MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Three material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C. |
| A. | 40 |
| B. | 80 |
| C. | 70 |
| D. | 90 |
| Answer» D. 90 | |
| 2. |
Correction is applied to LMTD for __________ flow |
| A. | parallel |
| B. | cross |
| C. | counter |
| D. | none of these |
| Answer» C. counter | |
| 3. |
One kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to |
| A. | evaporate the water. |
| B. | heat the water from 0°C to 100°C. |
| C. | to superheat the steam. |
| D. | data insufficient, can't be predicted |
| Answer» B. heat the water from 0°C to 100°C. | |
| 4. |
The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation |
| A. | greater than |
| B. | lower than |
| C. | half |
| D. | is same as |
| Answer» C. half | |
| 5. |
In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be |
| A. | more than 45°C |
| B. | equal to 45°C |
| C. | initially decreases and remains constant thereafter. |
| D. | less than 45°C |
| Answer» B. equal to 45°C | |
| 6. |
A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C. |
| A. | 12 |
| B. | 14 |
| C. | 18 |
| D. | 6 |
| Answer» B. 14 | |
| 7. |
Sensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU. |
| A. | 970 |
| B. | data insufficient, can't be predicted |
| C. | 3.97 |
| D. | 180 |
| Answer» E. | |