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Q. |
The pressure at the inlet or exit of the draft tube should not be |
A. | less than one third of atmospheric pressure |
B. | greater than one third of atmospheric pressure |
C. | less than one atmospheric pressure |
D. | greater than one atmospheric pressure |
Answer» A. less than one third of atmospheric pressure | |
Explanation: decrease in pressure in any portion of turbine below one third of atmospheric pressure may cause vapour bubbles or cavities to form. this phenomenon is called cavitation. also to maintain continuity of flow without vaporisation the pressure should not fall below vapour |
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