Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?
Correct answer: D. Brass
- A. Nickel
- B. Invar
- C. Chromel
- D. Brass
Explanation
Brass has a linear expansion coefficient of roughly 19 × 10⁻⁶ per °C, higher than nickel and chromel, while invar has an exceptionally low value. This difference in expansion is why brass is the maximum among the listed metals.
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