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

Both A and B
None of these
Free graphite
Cementite

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Engineering Materials
Carbon steel is

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

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Engineering Materials
Thermoplastic materials are those materials which

Are flexible and can withstand considerable wear under suitable conditions
Are used as a friction lining for clutches and brakes
Are formed into shape under heat and pressure and results in a permanently hard product
Do not become hard with the application of heat and pressure and no chemical change occurs

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