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Engineering Materials

Engineering Materials
Surveying tapes are made of a material having low coefficient of expansion and enough strength. The alloy used is

Invar
Silver metal
Duralumin
Hastelloy

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

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

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Engineering Materials
Sulphur in cast iron

Makes the iron soft and easily machinable
Make the iron white and hard
Increases hardness and brittleness
Aids fusibility and fluidity

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Engineering Materials
White cast iron contains carbon in the form of

Free carbon
Graphite
Cementite
White carbon

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Engineering Materials
Steel containing ferrite and pearlite is

Soft
Hard and tough
Tough
Hard

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Engineering Materials
Chromium when added to steel _________ the tensile strength.

Does not effect
None of these
Decreases
Increases

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