Q.

Which of the following alloys does not contain aluminium?

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a

Alnico

b

Duralumin

c

Constantan

d

Magnalium

answer is D.

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Detailed Solution

Constantan is an alloy of Cu (60%) and Ni (40%). In cupronickel. Cupronickel has high electrical resistivity; constantan, an alloy of 55 percent copper and 45 percent nickel, is used in resistors, thermocouples, and rheostats.

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