MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
What is the unit of Fouling factor (Rf) in S.I. system? |
| A. | m2K/Pa |
| B. | mK/Pa |
| C. | m2K / W |
| D. | mK/W |
| Answer» D. mK/W | |
| 2. |
What do you understand by Rfo and Rfi? |
| A. | Dirt factor and Fouling factor |
| B. | Inner Tube outer surface fouling factor and inner surface fouling factor |
| C. | Inner Tube outer surface fouling factor and inner surface fouling factor |
| D. | Inner Tube outer surface fouling factor and Annulus tube inner surface fouling factor |
| Answer» C. Inner Tube outer surface fouling factor and inner surface fouling factor | |
| 3. |
In a double pipe heat exchanger, in the inner side fluid enters at 15℃ and leaves at 65℃. The annulus has steam at 1atm. What is the value of LMTD? |
| A. | 39℃ |
| B. | 66.7℃ |
| C. | 70℃ |
| D. | 56.35℃ |
| Answer» E. | |
| 4. |
To calculate the temperature difference in a double pipe heat exchanger, we use _____ |
| A. | LMTD |
| B. | Mean temperature difference |
| C. | Median of the temperature difference |
| D. | Square mean of the temperature difference |
| Answer» B. Mean temperature difference | |
| 5. |
Which one of the following is true about a hairpin used in double pipe HE? |
| A. | It can handle high pressure drops |
| B. | It cannot handle high pressure drops |
| C. | It is very resistant to fouling |
| D. | It is very expensive |
| Answer» B. It cannot handle high pressure drops | |
| 6. |
The density of the fluids, its viscosity and the thermal conductivity (K) is measured at ______ |
| A. | LMTD |
| B. | Mean temperature |
| C. | Median of the temperature |
| D. | Square mean of the temperature |
| Answer» C. Median of the temperature | |
| 7. |
We can apply LMTD only when?(i) There is no change in Specific heats(ii) Overall heat transfer coefficient is constant(iii) No heat loss(iv) No pressure drop |
| A. | (ii)(iii)(iv) |
| B. | (i)(ii)(iii) |
| C. | (ii)(iii) |
| D. | (i)(ii)(iv) |
| Answer» C. (ii)(iii) | |
| 8. |
We can use mean temperature difference too in place of LMTD if we can calculate it. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Which one of these is not true when the steady state is reached by the heat exchanging fluids in a double pipe HE? |
| A. | When the two liquids have same temperature |
| B. | When their temperatures become stable |
| C. | Wall temperature becomes constant |
| D. | Rate of heat transfer becomes constant |
| Answer» B. When their temperatures become stable | |
| 10. |
Which one of the following is the determining reason for heat transfer in double pipe HE? |
| A. | Conduction |
| B. | Natural Convection |
| C. | Forced Convection |
| D. | Radiation |
| Answer» D. Radiation | |
| 11. |
How many types of flow operations exist for a double pipe heat exchanger? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 12. |
Which of the following has the maximum Log mean temperature difference for a Double Pipe Heat Exchanger? |
| A. | Counter-flow |
| B. | Parallel Flow |
| C. | Cross Flow |
| D. | Split Flow |
| Answer» B. Parallel Flow | |
| 13. |
If we know the output and input temperatures of the heat exchanging fluids, then which one of the following calculation is not required to determine the number of bends in tube for the equipment? |
| A. | Pressure drop in the equipment |
| B. | Overall heat transfer coefficients |
| C. | Total heat transfer area required |
| D. | Pipe length |
| Answer» B. Overall heat transfer coefficients | |
| 14. |
Gases cannot be used in Double pipe heat exchangers because of their high flow rates. |
| A. | True |
| B. | False |
| Answer» C. | |