Duralumin contains

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Duralumin contains

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WBPSC JE Mechanical 2018 Official Paper

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3.5% to 4.5% copper, 0.4% to 0.7% magnesium, 0.4% to 0.7% manganese and rest aluminium.
3.5% to 4.5% copper, 1.2% to 1.7% managanese, 1.8% to 2.3% Nickel, 0.6% each of silicon, magnesium and iron and rest aluminium.
4% to 4.5% magnesium, 3% to 4% copper and rest aluminium.
5% to 6% tin, 2% to 3% copper and rest aluminium.

Answer 1

The correct answer is (A).

Duralumin is an Aluminium alloy containing Al in a high percentage. The composition is mainly 90% aluminum, 4% copper, 0.51% magnesium, and less than 1% manganese.

Al and Mg are the main components of AZ91 alloy.
Al and Ni make up the ZA-27 alloy.
An alloy usually contains three metals as main elements, rest can be impurities.

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Duralumin contains

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