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In the given below figure of Mechanism of vacuum generation, point ‘2’ is the indication of _____(a) Poynting point(b) Vena contracta(c) Stack point(d) Steric point |
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Answer» Correct answer is (b) Vena contracta For explanation I would say: The constricted region at point 2 in the figure is known as vena contracta. A sudden change in the flow direction cause the aspiration effect and thus vacuum as the liquid metal stream contracts around a sharp corner due to the momentum effect. To avoid vacuum, the mould is made to fit the vena contracta. |
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