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Engineering Materials

Engineering Materials
The hardness of steel increases if it contains

Pearlite
Austenite
Martensite
Cementite

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Engineering Materials
Ball bearings are, usually, made from

High carbon steel
Chrome steel
Medium carbon steel
Low carbon steel

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Engineering Materials
Mild steel belongs to the following category

Low carbon steel
Medium carbon steel
High carbon steel
Alloy steel

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Engineering Materials
Bell metal contains

90% copper and 10% tin
70 - 75% copper and rest tin
70% copper and 30% zinc
85 - 92% copper and rest tin with little lead and nickel

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Engineering Materials
According to Indian standard specifications, plain carbon steel designated by 40 C8 means that the carbon content is

0.4 to 0.6%
0.35 to 0.45%
0.6 to 0.8%
0.0004

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Engineering Materials
Addition of silicon to aluminium results in

Improvement of corrosion resistance
One of the best known age and precipitation hardening systems
Improvement of casting characteristics
Improving machinability

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