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				| 1. | The engine oil at 150 degree Celsius is cooled to 80 degree Celsius in a parallel flow heat exchanger by water entering at 25 degree Celsius and leaving at 60 degree Celsius. Estimate the exchanger effectiveness | 
| A. | 0.56 | 
| B. | 0.66 | 
| C. | 0.76 | 
| D. | 0.86 | 
| Answer» B. 0.66 | |