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Engineering Materials

Engineering Materials
In malleable iron, carbon is present in the form of

Nodular aggregates of graphite
Flakes
Cementite
Free carbon

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Engineering Materials
Addition of lead and bismuth to aluminium results in

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

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Engineering Materials
In the lower part of the blast furnace (zone of fusion), the temperature is

800°C to 1000°C
400° to 700°C
1200°C to 1300°C
1500°C to 1700°C

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Engineering Materials
Maximum percentage of carbon in austenite is

0.008
0.00025
0.017
0.0026

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Engineering Materials
Which of the following display properties similar to that of steel?

Both (A) and (B)
Blackheart cast iron
Whiteheart cast iron
None of these

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Engineering Materials
The heat treatment process used for softening hardened steel is

Carburising
Annealing
Normalizing
Tempering

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