Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

None of these
Hypereutectic cast irons
Eutectic cast irons
Hypoeutectic cast irons

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Engineering Materials
In process annealing, the hypo eutectoid steel is

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

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