Question

In the given below figure of outlet dimensions to prevent vacuum generation, what should be the relation between d’ and d?

(a) d’/d = 1.3

(b) d’/d > 2

(c) d’/d = 2

(d) d’/d > 2.2

I got this question in class test.

This question is from Aspiration Effect topic in portion Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

Answer 1

The correct answer is:

(b) d’/d > 2

In the context of gating design and preventing vacuum generation, the outlet diameter (d') should be at least twice the inlet diameter (d). This ensures a sufficient flow of molten metal and prevents the creation of a vacuum, which could affect the quality of the cast. This ratio helps maintain proper flow dynamics in the gating system during casting.