Engineering Materials
Grey cast iron has

All of these
High tensile strength
Carbon in the form of free graphite
Low compressive strength

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Engineering Materials
Dow metal contains

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

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Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated below or closes to the lower critical temperature and then cooled slowly

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