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Engineering Materials

Engineering Materials
In nodular iron, graphite is in the form of

Cementite
Free carbon
Flakes
Spheroids

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Engineering Materials
Following elements have face-centered cubic structure

All of these
Mg, Zn, Ti, Zr, Br, Cd
A iron (below 910°C and between 1400 to 1539°C), W
Gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt

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Engineering Materials
Maximum percentage of carbon in austenite is

0.017
0.0026
0.00025
0.008

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Engineering Materials
A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Physical change
Solidus change
Allotropic change
Molecular change

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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
Addition of lead and bismuth 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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