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Engineering Materials

Engineering Materials
The percentage of carbon in grey iron castings usually varies between

0.5 to 1%
5 to 7%
2.5 to 4.5%
0.012

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Engineering Materials
The heat treatment process used for softening hardened steel is

Tempering
Carburising
Normalizing
Annealing

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Engineering Materials
The steel widely used for motor car crankshafts is

Nickel-chrome steel
Chrome steel
Nickel steel
Silicon steel

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Engineering Materials
In full annealing, 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
Any one of these
In still air
Slowly in the furnace

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Engineering Materials
The lower critical point for all steels is

723°C
700°C
913°C
600°C

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Engineering Materials
Nodular iron has

All of these
Low melting point
High tensile strength
High machinability

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