Engineering Materials
When medium carbon steel is heated to coarsening temperature

The grain size first increases and then decreases very rapidly
There is no change in grain size
The average grain size is a minimum
The grain size increases very rapidly

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Engineering Materials
Thermoplastic materials are those materials which

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

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