Question

___________ cores cannot make long narrow features.

(a) Green Sand

(b) Dry-Sand

(c) Metallic

(d) Lost

The question was posed to me in a national level competition.

My question is based upon Cores and Core Prints topic in section Foundry Introduction of Foundry and Forging

Answer 1

Right option is (a) Green Sand

To explain: The Green sand cores make a casting of the long narrow features difficult or impossible. Even for long features that can be cast, it will still leave much material to be machines.