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What is the general shape of an open riser?

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in Casting-Forming-Welding I by (687k points)
What is the general shape of an open riser?

(a) Cubical

(b) Trapezoidal

(c) Cylindrical

(d) Rounded

I had been asked this question at a job interview.

The question is from Types of Risers in portion Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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Best answer
Right choice is (c) Cylindrical

Explanation: The shape of an open riser is generally cylindrical. The top of the cylinder is open, causing the molten metal direct exposure to the atmosphere.

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