1.

For ferrous alloys, the breaking of mould should be done at a temperature_____(a) 780 ⁰C(b) 850 ⁰C(c) above 700 ⁰C(d) below 700 ⁰C

Answer» Correct answer is (d) below 700 ⁰C

Explanation: Ideally, the moulds should be broken at a temperature when no transformation occurs. For ferrous alloys, the breaking should be done at a temperature below 700 ⁰C. If the castings are fragile and thin, they should be removed at a temperature as low as 400 ⁰C to avoid any deformation to the metal castings at the time of breaking of mould.


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