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

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

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Engineering Materials
Points of arrest for iron correspond to

There is nothing like points of arrest
Stages at which further heating does not increase temperature for some time
Stages at which allotropic forms change
Stages at which properties do not change with increase in temperature

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Engineering Materials
Dow metal contains

94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
90% aluminium and 90% copper
92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
90% magnesium and 9% aluminium with some copper

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