31. | With the increase of temperature, the Col-burn jH factor |
a. | increases. |
b. | decreases. |
c. | remains unchanged. |
d. | may increase or decrease ; depending on temperature. |
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Answer: (a).increases.
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32. | In case of evaporators, liquid entrainment results primarily due to |
a. | high vacuum in the evaporator. |
b. | high evaporation rate. |
c. | foaming of the solution. |
d. | high heat transfer rate. |
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Answer: (c).foaming of the solution.
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33. | Baffles in the shell side of a shell and tube heat exchanger |
a. | increase the cross-section of the shell side liquid. |
b. | force the liquid to flow parallel to the bank. |
c. | increase the shell side heat transfer co-efficient. |
d. | decrease the shell side heat transfer co-efficient. |
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Answer: (c).increase the shell side heat transfer co-efficient.
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34. | Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is |
a. | finned tube heat exchanger with air inside and steam outside. |
b. | finned tube heat exchanger with air outside and steam inside. |
c. | shell and tube heat exchanger with air inside tubes and steam on shell side. |
d. | shell and tube heat exchanger with air on shell side and steam inside tubes. |
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Answer: (b).finned tube heat exchanger with air outside and steam inside.
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35. | The unit of heat transfer co-efficient in SI unit is |
a. | J/m²°K |
b. | W/m²°K |
c. | W/m°K |
d. | J/m°K |
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Answer: (b).W/m²°K
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