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Engineering Materials

Engineering Materials
Shock resisting steels should have

Toughness
Low tensile strength
Low wear resistance
Low hardness

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Engineering Materials
The machinability of steel is increased by

Phosphorous, lead and sulphur
Sulphur, graphite and aluminium
Silicon and sulphur
Phosphorous and aluminium

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

Allotropic change
Precipitation
Recrystallization
Heat treatment

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Engineering Materials
The alloying element which reduces the formation of iron sulphide in steel is

Vanadium
Manganese
Nickel
Chromium

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Engineering Materials
For a steel containing 0.8% carbon

There is no critical point
There is only one critical point
There are two critical points
There can be any number of critical points

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Engineering Materials
Recrystallization temperature can be lowered by

Working at lower temperature
Purification of metal
All of these
Grain refinement

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