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Engineering Materials

Engineering Materials
The hardness of steel increases if it contains

Austenite
Martensite
Pearlite
Cementite

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Engineering Materials
Body centered cubic space lattice is found in

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

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Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points of discontinuity
The points where there is no further flow of metal
The points where no further change occurs
Constant for all metals

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Engineering Materials
Balls for ball bearings are made of

Stainless steel
Mild steel
Carbon-chrome steel
Cast iron

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Engineering Materials
When low carbon steel is heated up to lower critical temperature

The grain size increases very rapidly
There is no change in grain size
The grain size first increases and then decreases very rapidly
The average grain size is a minimum

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Engineering Materials
Eutectoid reaction occurs at

600°C
723°C
1147°C
1493°C

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