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Which of the following gating systems is useful for casting drossy alloys?

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Which of the following gating systems is useful for casting drossy alloys?

(a) Pressurized gating system

(b) Partially pressurized gating system

(c) High pressurized gating system

(d) Non-pressurized gating system

The question was asked in an online interview.

The query is from Gating Design topic in chapter Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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Correct answer is (d) Non-pressurized gating system

Explanation: Non-pressurized gating system has choke at the bottom of the sprue base, have total runner area and in-gate areas higher than the sprue area. In this system, there is no pressure existing in the metal flow system and thus it helps to reduce turbulence. Hence this system can be used for casting drossy alloys such as aluminum and magnesium alloys.

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