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Engineering Materials

Engineering Materials
The metal suitable for bearings subjected to light loads, is

Silicon bronze
Phosphor bronze
White metal
Monel metal

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

Lead and bismuth
Magnesium
Silicon
Copper

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Engineering Materials
Perminvar alloy having constant permeability is an alloy of

Nickel, copper and iron
Nickel, copper and zinc
Copper, nickel and antimony
Iron, zinc and bismuth

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Engineering Materials
The purpose of heat treatment is to

Any one of these
Relieve the stresses set up in the material after hot or cold working
Modify the structure of the material
Change grain size

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Engineering Materials
Bronze contains

70% copper and 30% zinc
85 - 92% copper and rest tin with little lead and nickel
90% copper and 10% tin
70 - 75% copper and rest tin

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

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

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