Question

A low viscous fluid as lubricant is basically used for extraction of cores from the core boxes.

(a) True

(b) False

I have been asked this question in an interview for job.

My query is from Core Making Machines topic in section Foundry Mechanizations of Casting-Forming-Welding I

Answer 1

Correct option is (b) False

Easiest explanation: After ramming of sand, the core box is put on a core plate supported by the machine bed. A rapping action is generated on the core box by vibrating a vertical plate. This rapping action helps in extracting the core from the core box. After rapping the core box, the core is pulled up and gets onto the core plate.