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Engineering Materials

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

Magnesium
Silicon
Lead and bismuth
Copper

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Engineering Materials
Which of the following is an amorphous material?

Glass
Mica
Lead
Silver

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Engineering Materials
When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of

Ferrite and pearlite
Mainly pearlite
Pearlite and cementite
Mainly ferrite

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Engineering Materials
In high speed steels, manganese is used to tougher the metal and to increase its

Hardness
Melting point
Yield point
Critical temperature

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Engineering Materials
Which of the following has highest specific strength of all structural materials?

Magnetic steel alloys
Chromium alloys
Magnesium alloys
Titanium alloys

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

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

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