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What is the advantage of copper-constantan over iron-constantan?

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What is the advantage of copper-constantan over iron-constantan?

(a) Low density

(b) Low coefficient of expansion

(c) Low-temperature measurement

(d) Elevated temperature difference

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The correct answer is (c) Low-temperature measurement

Easy explanation: Copper-constantan differs from iron-constantan due to the use of copper instead of iron, along with the possible addition of manganese and iron. This is useful for measuring low temperatures up to -420 F and a maximum limit of 600 F.

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