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Engineering Materials

Engineering Materials
Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?

Sulphur
Manganese
Silicon
Phosphorus

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Engineering Materials
The machinability of aluminium increases when _________ is added to aluminium.

Magnesium
Silicon
Lead and bismuth
Copper

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Engineering Materials
For the allotropic forms of iron, the points of arrest are

The points where no further change occurs
The points of discontinuity
The points where there is no further flow of metal
Constant for all metals

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Engineering Materials
Hematite iron ore contains iron about

0.45
0.55
0.7
0.3

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Engineering Materials
Age-hardening is related with

Gun metal
German silver
Duralumin
Stainless steel

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Engineering Materials
Age hardening is related to

Copper
Brass
Silver
Duralumin

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