11. |
A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities and . The parameter NTU (number of transfer units ) used in the analysis of the heat exchanger is specified as
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Answer:
Option (a) |
12. |
During the process of boiling and condensation, only a phase change takes place and one fluid remains at a constant temperature throughout the heat exchanger. In terms of the number of transfer units (NTU), the effectiveness of such an exchanger would be
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Answer:
Option (b) |
13. |
The equation of effectiveness for a heat exchanger is valid in case of
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Answer:
Option (c) |
14. |
method is particularly useful in the thermal design of heat exchanger when
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Answer:
Option (a) |
15. |
Which of the following terms is not associated with heat exchangers?
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Answer:
Option (b) |
16. |
The overall heat transfer coefficient for a shell and tube heat exchanger for clean surfaces is . The fouling after one year of operation is found to be . The overall heat transfer coefficient at this time is
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Answer:
Option (c) |
17. |
A correction of LMTD is necessary in case of ................ heat exchanger
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Answer:
Option (a) |
18. |
In a certain heat exchanger, both the fluid have identical mass flow rate specific heat product. The hot fluid enters at and leaves at and the cold fluid enters at and leaves at . The effectiveness of the heat exchanger is
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Answer:
Option (a) |
19. |
Consider the following is not an advantage of recuperator type heat exchanger?
Select the correct answer code:
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Answer:
Option (d) |
20. |
Air heaters are an example of
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Answer:
Option (a) |