MCQOPTIONS
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MCQOPTIONS
This section includes 11 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 a double pipe heat exchanger, in the inner side fluid enters at 20℃ and leaves at 45℃. The annulus has steam condensing at 1atm. What is the value of LMTD? |
| A. | 39℃ |
| B. | 66.7℃ |
| C. | 70℃ |
| D. | 40.5℃ |
| Answer» C. 70℃ | |
| 2. |
For the calculation of Overall Heat transfer coefficient for fouling factor R, which one of the following expression do we use? |
| A. | (hi-1+ho-1 + R-1) |
| B. | (hi-1+ho-1 + R)-1 |
| C. | (hi + ho + R)-1 |
| D. | (hi-1+ho-1 + R-1)-1 |
| Answer» C. (hi + ho + R)-1 | |
| 3. |
Consider we have a Double pipe Heat Exchanger, with inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B (KA = 15W/mK and KB = 20W/mK) we desire to have their flow rates as 15m3/s and 21m3/s respectively. If their Nusselt number after calculation is Nui = 429 and Nuo = 530. What is the overall heat transfer coefficient of the equipment is no fouling exists? |
| A. | 168.4 W/m2K |
| B. | 168.4×103 KW/m2K |
| C. | 188.4 W/m2K |
| D. | 168.4 KW/m2K |
| Answer» E. | |
| 4. |
When gas is used as a fluid in a double pipe heat exchanger, which one of the following is not true? |
| A. | The gas side has a low heat transfer coefficient |
| B. | Extended fins are used on the gas side to increase the Heat Transfer coefficient |
| C. | The gas side heat transfer coefficient is the highest |
| D. | Fins increase necessary heat transfer area |
| Answer» D. Fins increase necessary heat transfer area | |
| 5. |
In an operation where we want to heat a stream of liquid by Steam, we have the option to use extended fins. Then which of the following is best suited? |
| A. | Steam on the annular side with the fins on the cold liquid side |
| B. | Steam on the annular side with the fins on the steam side |
| C. | Steam on the inner side with the fins on the cold liquid side |
| D. | Steam on the inner side with the fins on the steam side |
| Answer» C. Steam on the inner side with the fins on the cold liquid side | |
| 6. |
Which of the following is not a subset of the category of Tubular Heat Exchangers? |
| A. | Double pipe |
| B. | Finned pipe |
| C. | Shell and Tube |
| D. | Spiral tube |
| Answer» C. Shell and Tube | |
| 7. |
In an operation when we want to heat a stream of liquid by Steam, we usually keep steam on the annular side and fluid on the inner side. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
How many times do we have to calculate for Nusselt number in a Double Pipe Heat Exchanger? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 9. |
Consider we have a Double Pipe Heat Exchanger, with the inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B, we desire to have their flow rates as 15m3/s and 21m3/s respectively. Which fluid pass arrangement would be best suited for the HE? |
| A. | Parallel flow with A in inner pipe and B in the annulus |
| B. | Counterflow with B in inner pipe and A in the annulus |
| C. | Counterflow with A in inner pipe and B in the annulus |
| D. | Parallel flow with B in inner pipe and A in the annulus |
| Answer» D. Parallel flow with B in inner pipe and A in the annulus | |
| 10. |
Which is the major mean of heat transfer in a Double Pipe heat exchanger? |
| A. | Convection |
| B. | Conduction |
| C. | Radiation |
| D. | Combined Convection and Conduction |
| Answer» E. | |
| 11. |
If in a double pipe heat exchanger, we require to have a constant wall temperature, we use it in a counter-flow direction. |
| A. | True |
| B. | False |
| Answer» C. | |