Question

_________ is exposed to atmosphere in open riser.

(a) Top end

(b) Bottom end

(c) Partial upper end

(d) Partial bottom end

The question was posed to me in an interview for internship.

My question is taken from Types of Risers in chapter Concept of Gating and Risering of Foundry and Forging

Answer 1

Correct choice is (a) Top end

Easiest explanation: The open riser is the one in which the full riser indicates that the mould cavity has already been completely filled up with the same. It happens because the top end is exposed to the atmosphere.