Addition of copper to aluminium results in

A Improvement of casting characteristics
B Improvement of corrosion resistance
C One of the best known age and precipitation hardening systems
D Improving machinability

Correct Answer: One of the best known age and precipitation hardening systems

The copper provides substantial increases in strength and facilitates precipitation hardening.
The introduction of copper to aluminum can also reduce ductility and corrosion resistance.
Bissoy MCQ
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A 50 : 50
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B 26
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If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 17 : 43
B 13 : 42
C 19 : 43
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If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
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The average of 17 results is 60. If the average of first 9 results is 57 and that of the last 9 results is 65, then what will be the value of 9th result?
A 39
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The machinability of aluminium increases when _________ is added to aluminium.
A Copper
B Magnesium
C Silicon
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Due to which of the following reasons copper and aluminium are not used for heating elements ?
A Both have great tendency for oxidation
B Both have low melting point
C Very large length of wires will be required
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