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| Q.40 | The function of an air pre-heater is _____________. | |
| Ans | 1. to decrease the temperature of air before entering the furnace | |
| 2. to decrease the temperature of air after entering the furnace | ||
| 3. to increase the temperature of air before entering the furnace | ||
| 4. to increase the temperature of air after entering the furnace |
Correct Ans Provided: 3
