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Engineering Materials

Engineering Materials
Heavy duty leaf and coil springs contain carbon of the following order

0.01
0.008
0.002
0.005

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Engineering Materials
Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

Phosphorus
Sulphur
Silicon
Manganese

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Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 80
RC 65
RC 57
RC 48

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Engineering Materials
The molecules in a solid move

In circular motion
In a haphazard way
Back and forth like tiny pendulums
In a random manner

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Engineering Materials
Iron ore is usually found in the form of

Oxides
Carbonates
All of these
Sulphides

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Engineering Materials
Addition of silicon to aluminium results in

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

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