Question

Which of the following effects is the effect caused by the ignition of oxygen due to high pressure and temperature of melt?

(a) Otto effect

(b) Dual effect

(c) Diesel effect

(d) Rankine effect

I got this question during an internship interview.

I'd like to ask this question from Venting of Moulds topic in division Mold and Mold Making of Casting-Forming-Welding I

Answer 1

Correct answer is (c) Diesel effect

To elaborate: Proper mould venting is very important and necessary for producing quality casting parts. During the moulding process, the gases included in the mould needs a way to escape, or else the molten metal will compress and trap those gases in the mould cavity. A combination of high melt pressure and temperature will then ignite the oxygen and will cause an effect that is called a diesel effect.