| Q.27 | NTU refers to: | |
| Ans | 1. the compactness of heat transfer unit irrespective of heat transfer effectiveness . | |
| 2. the closeness of heat exchanger with its thermodynamic limit of operation. | ||
| 3. the number of transfer units of passes required for effective heat transfer. | ||
| 4. the number of transfer units of pipes required for effective heat transfer. |
Correct Ans Provided: 2