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Engineering Materials

Engineering Materials
Eutectoid reaction occurs at

600°C
723°C
1147°C
1493°C

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Engineering Materials
A small percentage of boron is added to steel in order to

Increase hardenability
Reduce machinability
Increase wear resistance
Increase endurance strength

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Engineering Materials
Hematite iron ore contains iron about

0.45
0.55
0.3
0.7

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Engineering Materials
Closed packed hexagonal space lattice is found in

Gamma-iron, aluminium, copper, lead, silver and nickel
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
None of these
Alpha-iron, tungsten, chromium and molybdenum

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Engineering Materials
The machinability of steel is improved by adding

Nickel and chromium
Sulphur, lead and phosphorus
Chromium
Nickel

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Engineering Materials
Which of the following pipes is least corrosion resistant?

Cast iron
Brass
Mild steel
Wrought iron

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