Question

Which of the following furnaces is used for the directional solidification of cast ingots of eutectic?

(a) Pneumatic zone furnace

(b) Cupola furnace

(c) Hydraulic zone furnace

(d) Optical floating zone furnace

I had been asked this question by my college director while I was bunking the class.

I want to ask this question from Directional Solidification topic in section Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

Correct answer is (d) Optical floating zone furnace

Explanation: The drop cast ingots are directionally solidified using an optical floating zone furnace, in which radiation is emitted from a xenon lamp and focused on the specimens enclosed in a quartz tube which is basically evacuated first and back filled with the argon gas. And then drop-cast rods are used as the feed material for the performing of other operations.