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| Q. |
type draft tube? |
| A. | 10 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» C. 60 | |
| Explanation: the efficiency of the simple elbow type draft tube is 60 percent. the exit diameter for a simple elbow draft tube should be large as possible. it helps to cut down the cutdown the cost and recover the kinetic energy at the outlet of runner. the simple elbow draft tube is placed close to the tail race. | |
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