Question

__________ portions sticking out of inside the castings are removed by poking and action of the metal rod.

(a) Pattern

(b) Cores

(c) Sand

(d) Gates

The question was posed to me in examination.

My doubt is from Fettling and Cleaning of Castings topic in section Concept of Gating and Risering of Foundry and Forging

Answer 1

Correct option is (c) Sand

To explain I would say: It may be difficult to remove dry sand and hardened cores in the absence of suitable equipment. Hammering or vibrations imparted to the cores does not loosen and break them up. Hence they are removed by poking action using a metal rod.