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Engineering Materials

Engineering Materials
Maximum percentage of carbon in austenite is

0.008
0.017
0.00025
0.0026

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

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Engineering Materials
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

More than
Less than
None of these
Equal to

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Engineering Materials
Vanadium in high speed steels

Provides high hot hardness
Promotes decarburisation
Forms very hard carbides and thus increases wear resistance
Promotes retention of austenite

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Engineering Materials
Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

Manganese
Sulphur
Silicon
Phosphorus

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Engineering Materials
There are fourteen atoms in a unit cell of

Close packed hexagonal space lattice
None of these
Body centered cubic space lattice
Face centered cubic space lattice

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