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Engineering Materials

Engineering Materials
Chromium when added to steel _________ the tensile strength.

Increases
Does not effect
None of these
Decreases

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Engineering Materials
Delta iron occurs at temperature of

Between 910°C and 1400°C
Between 1400°C and 1539°C
Above melting point
Room temperature

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Engineering Materials
Hardness of upper bainite (acicular structure) is about

RC 57
RC 65
RC 80
RC 48

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Engineering Materials
Taps dies and drills contain carbon

Above 2.2%
Below 0.5%
Above 1%
Below 1%

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Engineering Materials
Wrought iron

All of these
Is a ductile material
Cannot stand sudden and excessive shocks
Can be easily forged or welded

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Engineering Materials
Tensile strength of steel can be safely increased by

Adding small quantities of copper
Adding carbon up to 2.8%
Adding carbon up to 0.83%
Adding carbon up to 6.3%

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