A vertical tapered sprue of 16 cms length is, kept full during pouring. To just avoid any aspiration, the cross-sectional areas at the centre and the bottom of the sprue must be in the ratio of

A vertical tapered sprue of 16 cms length is, kept full during pouring. To just avoid any aspiration, the cross-sectional areas at the centre and the bottom of the sprue must be in the ratio of Correct Answer √2 : 1

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