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Engineering Materials

Engineering Materials
Eutectoid reaction occurs at

1493°C
600°C
723°C
1147°C

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Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

Eutectic cast irons
Hypoeutectic cast irons
None of these
Hypereutectic cast irons

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

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

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Engineering Materials
Bell metal contains

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

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Engineering Materials
The stiffness is the ability of a material to resist

Deformation under stress
Fracture due to high impact loads
Externally applied forces with breakdown or yielding
None of these

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Engineering Materials
Addition of copper to aluminium results in

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

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