| 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. |
| View Answer Report Discuss 50-50! |
|
Answer: (a).increases.
|
| 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. |
| View Answer Report Discuss 50-50! |
|
Answer: (c).foaming of the solution.
|
| 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. |
| View Answer Report Discuss 50-50! |
|
Answer: (c).increase the shell side heat transfer co-efficient.
|
| 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. |
| View Answer Report Discuss 50-50! |
|
Answer: (b).finned tube heat exchanger with air outside and steam inside.
|
| 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 |
| View Answer Report Discuss 50-50! |
|
Answer: (b).W/m²°K
|