Engineering Materials
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.

None of these
Cementite
Both A and B
Free graphite

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Engineering Materials
Carbon steel is

Extensively used for making cutting tools
Refined from cast iron
Made by adding carbon in steel
An alloy of iron and carbon with varying quantities of phosphorus and sulphur

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Engineering Materials
Y-alloy contains

3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
5 to 6% tin, 2 to 3% copper and rest aluminium
3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

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